Turtles on The Simpsons

Sage advice from The Simpsons

The Simpsons have a lot of turtle references. (It seems unusually high for a non-recurring 'character'. Almost every reference is to a different turtle. (The clip shows, like All Singing, All Dancing, sometimes have duplicate references.) I've counted on average two per season. That makes roughly 10% of the episodes that have a turtle reference that I've seen.) The purpose of this page is to document those occurrences and maybe try to find a pattern.

I recently found another page along a similar vein: Reptiles and The Simpsons, to which I owe thanks for the Treehouse of Horror II and Simpsoncalifragilisticexpiala-D'OH!-cious references.

Suspects

Can a pattern be detected to when the turtles appear? I haven't found one yet, but I have my suspicions.

Episode list

Ep #	Episode Title	Reference
MG42	Shorts: Maggie in Peril	In one of the Tracy Ullman shorts, Maggie has a turtle toy.
03x07	Treehouse of Horror II	Homer is fired and gets a job as a gravedigger. Willie: Deeper! Wider! Faster! I wouldn't bury m' turtle in that mud puddle!
03x22	The Otto Show	Chalkboard gag: "I will not spin the turtle"
04x08	New Kid on the Block	Decor in the Frying Dutchman includes a turtle in a net. Note: This decor shows up again in a later episode: Guess Who's Coming to Criticize Dinner.
05x13	Homer and Apu	Chalkboard gag: "I will not go near the kindergarten turtle"
05x17 20x11	Bart Gets an Elephant How the Test Was Won	The Turtle Terrapin Wax turtle grabs Homer's hair. Note: This scene is cut in syndication[1]. While Lisa complains about being stuck in the house... In the basement, Homer is about to clean the floor and hesitates between bottles of Bubble Off, Terrapin Wax, Cleanser... He settles for Mr. Cleanser. Homer: Hmm... [reading] "Use only in a well-ventilated area." [looks around] Shove it, buddy! [pours most of the bottle on the floor] Homer grunts as he scrubs the floor, but the fumes soon make him dizzy. In his hallucination, the logos of the various cleaning products come to life. At first friendly, they turn evil and attack him; several Bubbles biting him, the Turtle pulling his hair strands, the Cleanser knight stabbing him with his spear, and Mr. Cleanser strangling him. The clip shows up later as Homer remembers his past injuries in season 20's "How the Test Was Won".
06x07	Bart's Girlfriend	After Bart's new girlfriend pulls a fire alarm, Willy attempts to save the wee tur'les. Willy: If I don't save the wee tur'les, who will? [beat] doh! Save me from the wee tur'les, they were too quick for me aaaggghh...
06x08	Lisa On Ice	When Bart's team wins a hockey game, Homer pulls out a turtle Homer: Well Boy, you won, so I'm going to live up to my side of the agreement. Here's your turtle, alive and well. Meanwhile, Lisa finds she's failing gym class and imagines being impeached from the presidency in the future because she failed gym Justice: I sentence you to a lifetime of horror on Monster Island. [aside] Don't worry, it's just a name. Lisa: [running from Gamera] He said it was just a name! Fellow runner: What he meant was that Monster Island is actually a peninsula. Note: These same kaiju would show up in a later episode: "Thirty Minutes Over Tokyo", then Homerzilla will battle Gamera in Treehouse of horror XXVI
06x20 09x11	Two Dozen and One Greyhounds All Singing, All Dancing	Mr. Burns: Some men hunt for sport, others hunt for food. The only thing I'm hunting for, is an outfit that looks good... See... my... Vest. See my vest. Made from real gorilla chest. [...] Grizzly bear underwear, Turtle's necks I've got my share. [...] but a greyhound fur tuxedo would be best. So let's prepare these dogs... Maid: Kill two for matching clogs. Mr. Burns: See my vest, see my vest, oh please won't you see... my... Vest! I really like the vest. Smithers: I gathered, yeah... Lisa: He's gonna make a tuxedo out of our puppies! Bart: [still humming the tune] Na na na na na na naa naaaa... Lisa: Bart! Bart: Sorry... You gotta admit it's catchy. This song is reprised in the season 9 clip show, All Singing, All Dancing
07x19	A Fish Called Selma	Troy McClure proposes to Selma at a drive-in theater showing of his movie: The Muppets Go Medieval Troy McClure: That's not cigars baby, that's love. Troy: No longer canst I conceal my love, my wimpled turtledove. Selma and Miss Piggy both moan. Troy: Oh, princess fair, wilst thou grant me thine dainty hoof in marriage? Piggy: Oh, Sir Lies-a-lot, I will! Selma: (at the same time) Oh, Troy, I will! (Yes, I know turtledoves aren't turtles.)
08x09	El Viaje Misterioso de Nuestro Homer	Homer goes on a vision quest after eating the Merciless Peppers of Quetzalsacatanango. Homer: Huh? A tortoise?! [reading] Follow... the... [gasp] This must be why I'm here! Follow the what!? Follow the what!? Hurry up! [beat] D'Oh!
08x10	The Springfield Files	Mulder and Scully, while investigating Homer's claim of an alien sighting, run across Abe who's lost his teeth to a turtle. Abe: For the love of God help me! I've been here for four days and a turtle's got ahold of my teeth! There he is! [high speed chase] [...] Ow! He bit me with my own teeth!
08x13	Simpsoncalifragilisticexpiala-D'OH!-cious	Homer tells Marge she has his full attention as we cut to Homer's brain and see a turtle and some farmyard animals playing Turkey in the Straw.
08x18	Homer vs. The Eighteenth Amendment	After a prohibition law is rediscovered on the Springfield books (on St Patrick's Day), Rex Banner comes to town to clean up Eliot Ness style. Hunting for the Beer Baron, he raids Moe's Pet Shop (speakeasy): Rex Banner: What kind of pet shop is filled with rambunctious yahoos and hot jazz music at 1 AM? Moe: Um. the... the best damn pet shop in town! Crowd: Yeah! (clink glasses) Rex Banner: Alright. But you people remember; baby turtles and alligators may seem like a cute idea for a pet, but they grow up!
09x12	Bart Carny	One of the prizes in the ring toss booth is a turtle. (I knew there had to be one in this episode. There are just too many images in the carnival for there to not be one. It took me a while to find it though.)
09x17	Lisa the Simpson	Lisa, afraid she's going to succumb to the Simpsons Gene goes on TV to talk about some things that have meant a lot to her Lisa: And please don't deprive yourselves of wonderful books like "To Kill a Mockingbird", "Harriet the Spy" and "Yertle the Turtle" -- possibly the best book ever written on the subject of turtle stacking. Chief Wiggum: [In bed, reading "Yertle the Turtle"] She's got that right. Yertle the Turtle also shows up in 25x02 Treehouse of Horror XXIV
10x05 13x17	When You Dish Upon a Star Gump Roast	Snapping turtles chase after Homer. I wrote that down when the episode first aired, but I've had a hard time finding it whenever it aired in syndication. Now I know why. It was cut in the syndicated version[2]. Marge: [driving boat] How's he doing? Bart: I don't know. I think Dad might be a little heavy for parasailing. Homer: [tiptoeing across water] Faster, Marge! Faster! [looking over his shoulder at turtles] The snapping turtles are massing! They also edited out the same scene from the syndicated version of the clip show Gump Roast[3].
10x10	Viva Ned Flanders	While paying for a carwash, Ned Flanders gets a senior discount Homer: Hey! How did Churchy La Femme get half price? Clerk: Senior citizens' discount. Note: Churchill "Churchy" La Femme was a mud turtle in the Pogo comic strip.
10x23	Thirty Minutes Over Tokyo	Returning from a trip to Tokyo, the plane the Simpsons are on is shaken. Pilot: Uh, folks, we're experiencing some moderate Godzilla-related turbulence at this time, so I'm going to go ahead and ask you to put your seatbelts back on. When we get to 35 thousand feet, he usually does let go, so from there on out, all we have to worry about is Mothra, and, uh, we do have reports he's tied up with Gamera and Rodan at the present time. Thank you very much. Note: These same kaiju showed up in an earlier episode: "Lisa On Ice", later Homerzilla will battle Gamera in "Treehouse of horror XXVI"
11x03	Guess Who's Coming to Criticize Dinner	Turtle decor from the Frying Dutchman Note: This decor shows up in an earlier episode: New Kid on the Block.
11x07	Eight Misbehavin'	While trying to free Apu's octuplets from the zoo, they see a turtle swinging through the trees. Apu: These animals certainly act different at night.
11x15	Missionary Impossible	Homer wears a turtle-shell helmet in a nod to The Flintstones
11x19	Kill the Alligator and Run	After hitting an alligator, Homer dives in the swamp to flee the police and comes up with a few animals biting him, including a few little snapping turtles.
12x09	HOMЯ	Homer has a crayon removed from his brain, improving his intelligence. In a visit to the library we run across Cletus about to make some turtle soup. Lisa: I think books have an amazing power to bring people together. Look, even Cletus is checking one out. [Cletus pulls out a turtle and a bib] Cletus: Now hold still. Nothing cracks a turtle like Leon Uris. [turtle bites him] Cletus: Ow! Dangit! [drops book on his finger] Cletus: Ow! Note: The art for this turtle appears to be the same as the turtle in episode 11x07, Eight Misbehavin'
14x01	Treehouse of Horror XIII (The Island of Dr. Hibbert)	In this Island of Doctor Moreau parody, Moleman is a tortoise
14x03	Bart vs. Lisa vs. The Third Grade	Bart is demoted to the third grade and Lisa is promoted to the third grade. In the background we see that the third grade classroom has a pet turtle. Note: One of the chalkboard gags indicates that the Kindergarten classroom has a turtle as well. Another chalkboard gag mentions a generic turtle Bart is not supposed to spin. Also, in Bart's Girlfriend, we see that the Science Lab has a lot of "Wee Tur'les".
14x04	Large Marge	While Lisa and Homer spend their father-daughter time building a house for Domiciles for the Destitute, Homer paints "El Homo" on the house trying to be cool like "El Barto". Then after realizing how it sounds he desperately paints over it. Lisa: Dad, you're getting paint on your wedding ring! Homer: Huh? Oh right. Can you hold it? Lisa: This is a Band-Aid wrapped in tin foil. Homer: My real ring's inside a turtle. Marge thinks she sees Homer flirting and goes to a plastic surgeon to get liposuction, but ends up getting breast implants. Hilarity ensues.
14x06	The Great Louse Detective	Marge goes to a spa and gets a Turtle Massage after which, the turtles are tossed into a bin marked "used turtles."
14x07	Special Edna	"And now, enjoy the soothing music of The Turtles" (OK, so this reference is cheating since it's referring to the band, not to turtles themselves, but I'm counting it :P)
14x20	Brake My Wife, Please	On a school field trip to the aquarium, a turtle punches Bart after he moons the crowd.
14x21	The Bart of War	While cleaning up litter, Kirk Van Houten (leading the Cavalry Kids) accidentally impales a tortoise.
15x12	Milhouse Doesn't Live Here Anymore	Milhouse and his mother move to Capital City, leaving Bart to adopt Lisa as his new best friend. Lisa: The mound builders worshiped turtles as well as badgers, snakes, and other animals. Bart: Thank god we've come to our senses and worship a carpenter who lived 2000 years ago.
15x16	The Wandering Juvie	Bart gets sent to juvenile hall. Yard equipment includes a rocking turtle.
15x18	Catch 'Em If You Can	Kent Brockman: I guess you could call him "The Little Tortoise That Couldn't"! See our website for the recipe. (I originally found this quote on the net. It took me two years to finally find what episode it came from. Let me tell you, noone on the 'net has the quote right. Most say he says "turtle". Some say "check the webpage for recipes". &etc.)
15x20	The Way We Weren't	During the flashback scenes Marge and Homer Elvis kiss to the music of The Turtles (Happy Together)
16x14	The Seven-Beer Snitch	In order to find out why Snowball likes another family better than the Simpsons, Bart comes up with an excuse to see in their house. Bart: My baby turtle crawled into your basement window! Woman: Oh, you poor boy. What's your turtle's name? Bart: [looking at woman] Uhh... Apronboobsface? Woman: Really? Well, let's go find him!.
16x15	Future-Drama	Bart and Lisa find themselves in Prof. Frink's basement and he uses the science of astrology on his new computer to show them their future, eight years from next Tuesday. At their graduation party, Nelson flees fatherhood on the back of a sea turtle.
16x16	Don't Fear The Roofer	Homer goes in for electroshock therapy because everyone believes he's crazy. Bart asks him to hold his dead turtle while he's getting shocked to try to revive it.
17x08	The Italian Bob	During the diversity film at the beginning a legend about a turtle is mentioned. Narrator: Welcome, to Diversity Tales! Students groan Willie: Enjoy your multi-cultural hooey! [laughs] Narrator: It was the Feast of the Sea Lion Who Would Not Share girl: Come brother Chi-chi, let us collect Cha-cha sticks! boy: I will make a headdress for the wedding of Earth Turtle and Moon Mongoose bird: You don't need a headdress! Your most beautiful costume is your self-esteem. (Spelling of names approximate.)
17x18	The Wettest Stories Ever Told	In Mutiny on the Barty (a parody of Mutiny on the Bounty), Skinner gets marooned with Willy, who then maroons him on a turtle. (Seymour) Bligh: Sing a round! Willie: Row row row your boat, gently down the stream, Merrily, Merrily, row row, oh so merrily, not so merrily, row row, very merrily... [gives up] I can't do it, sir! I'm just one man! Bligh: What are you gonna do? Mutiny? [cuts to Bligh on a sea turtle as Willie rows away] Bligh: Swim faster or I'll have you made into soup! What are you gonna do? Go underwater? [the sea turtle does so] Bligh: [underwater] You call this "deep"?!
17x19	Girls Just Want to Have Sums	At the beginning of the episode, the Simpsons are attending Stab-a-Lot: the Itchy and Scratchy Musical (a parody on The Lion King / Spamalot), and an actor in a turtle costume leads the animals down the aisle.
18x04	Treehouse of Horror XVII	In the You Gotta Know When To Golem segment, Homer mentions Bart's turtle. *loud moan* Homer: [drunk] Bart, there's something I have to tell you, father to son. I passed out on your turtle and killed it. Someday you'll thank me.
18x10	The Wife Aquatic	Marge goes back to a happy place from her childhood, only to find it's not what she remembered. A carousel she loved has a turtle on it. (It's interesting that when they "refurbished" the ride, the turtle had a different shell pattern on it.)
18x12	Little Big Girl	Lisa fakes her family heritage in the 'Hitachi' tribe for a school project. John Squawkingbear: Lisa, hi, my name is John squawkingbear, I'm a reporter for the Chippewa Bugle. [...] I've never heard of the Hitachi [...] where were you centered? Lisa: Centered? Centered... You know where the four states come together? Squawkingbear: Oh quite well. Lisa: Not there. Not even close. Squawkingbear: In the name of the Great Turtle, will you answer the question!?
18x15	Rome-old and Juli-eh	Marge: Awwww look at Grandpa and Selma frolicking in the water. Homer: It's not right! It's like an old sea turtle dating a suitcase that fell out of a plane. (Loved the parody of the Battle of Helm's Deep in this episode.)
18x20	Stop, Or My Dog Will Shoot!	First we believed Cletus was bitten by a turtle, we now have proof that he was actually bitten by a wereturtle! Brandine: Cletus, you coward, is you man or turtle? Cletus [crawling away like a turtle]: Here's your answer, "skittle skittle scurry skittle."
19x01	He Loves to Fly and He D'oh's	Homer develops a taste for flying. After failing to get a job that would involve travel, Homer hides out at Krusty Burger when we see the school children arrive. Milhouse: Principle Skinner, why did we have to leave the Learn-and-Touch Reptile Zoo so early? Skinner: Well, it seems someone was riding the giant tortoise naked. Otto: It's not my fault. The drinking fountain dared me to do it. Of course, I loved the bits in Chicago in the beginning of this episode.
19x02	The Homer of Seville	In a parody of Entourage, Lenny dresses like Turtle. Turtle is also referenced in 21x01 Homer the Whopper (I have to admit I didn't catch this until I saw it on the Wikia page.)
19x04	I Don't Wanna Know Why the Caged Bird Sings	A turtle shows up in the baseball game in the Itchy and Scratchy Show.
19x06	Little Orphan Millie	A sign at the Van Houten wedding reads "PLEASE DO NOT KICK SEA TURTLES".
19x07	Husbands and Knives	A new comic store opens across the street from Android's Dungeon. The new Comic guy has a Girlfriend!! (Who wears a turtle t-shirt.) (There are probably other turtles in this episode, as there are a ton of images flashing by in the comic stores and I know there were other kaiju around, so there's probably a Gamera I have not yet been able to spot somewhere.) (I loved Comic Book Guy's parody of the iconic Spider-Man No More cover when he goes out of business.)
19x15	Smoke on the Daughter	Lisa, as Angelica Button (a parody of Harry Potter), wears a tortoise-shell barrette. (There's also a kid with a Harry Potter scar in the crowd.) Comic Book Guy: Nice Angelica Button costume Lisa. Althoooouuuugh... the Griffin on your coat of arms is facing left, not right. And FYI, Angelica wears TWO tortoise-shell barrettes. Nice try though. Lisa: I based my costume on the BOOKS not the movies. Crowd: [laughs at CBG]
19x18	Any Given Sundance	While filming a video project for school, Lisa films a turtle and then Barney 'turning turtle'.
20x20	Four Great Women and a Manicure	After a season that's been a bit dry on turtle references, some catch up is necessary. This episode actually has THREE turtles in it! The first shows up during the Snow White segment. Lisa uses her animal wiles to convince a turtle to climb into the soup pot. During Maggie's story, there are two drawings of turtles on the nursery wall. (I love this segment. I'm not necessarily a big Ayn Rand fan, but I do like The Fountainhead -- I like architecture and self-reliance.)
21x01	Homer the Whopper	Homer gets a part in a movie and gets a personal trainer. Partway through the film the trainer leaves and Homer returns to his normal self. Homer: Who did you leave me for? [...] Lyle McCarthy: OK, it was Turtle, from Entourage. Turtle is also referenced in The Homer of Seville
22x06	The Fool Monty	Mr Burns gets some bad news that he will die soon. Smithers finds him at the top of a cliff. Smithers: Sir! What are you doing? Burns: Smithers, I want to die quietly, on my own terms, crushing as many of those baby sea turtles as I possibly can. Goodbye insufficiently cruel world!
22x11	Flaming Moe	Mr. Burns writes a will naming his pet tortoise, Sheldon, as a beneficiary. Burns voiceover: I, C. Montgomery Burns, hereby divide my estate in equal shares to: The Yale University Department of Applied Evil, Gary from Gary's Trapdoor Installation and Repair, and finally my faithful and constant companion... Smithers: Your tortoise?!?! Burns: Yes, it always saddens me that you and Sheldon have never gotten along.
23x17	Them, Robot	Mr Burns replaces the nuclear plant's workers with robots. When things go awry, Bart uses the head of one for a turtle tank.
24x06	A Tree Grows in Springfield	Homer dreams about playing baseball and accidentally breaks the sky, letting in the sea, including one turtle swimming over the field.
24x12	Love is a Many-Splintered Thing	One of the performers uses a turtle shell as an instrument
24x17	What Animated Women Want	Voice-over: When all is lost, a man's mind turns to one thing, and one thing only Chef: What fish may I deplete from our oceans for your passing pleasure? Perhaps some Shark Fin Soup? Whale Tonsils? Baby Dolphin Blow-Hole? Turtle Smile? Homer: I'd like a lot of food, and for this to be the last decision I have to make.
25x02	Treehouse of Horror XXIV (Oh, the Places You'll D'Oh)	The Fat in the Hat knocks over a Yertle the Turtle-esque turtle tower. Yertle the Turtle also shows up in 09x17 Lisa the Simpson
25x08	White Christmas Blues (Itchy & Scratchy: It's a Wonderful Knife)	A turtle walks by in the background in the beginning of the Itchy & Scratchy episode during the It's a Wonderful Life parody
25x12	Diggs	Bart: Well, my dad said don't bring home any more dogs, cats, turtles, or snakes, but he never said anything about predatory birds!
26x20	Let's Go Fly a Coot	I've probably missed a couple this season, but this episode has lots of turtles. Yale graduates popping out of a birthday cake as Teenage Mutant Ninja Turtles Abe: I had a crucial job too -- keepin' desert turtles off the runway. Abe: Shoo! Shoo now! Pilot: Just pick them up! Abe: eeehh.. They feel weird! Abe: He didn't get a single word! You got the point didn't ya son? Homer: Uh, you used to work with turtles? Abe: (sarcastic) Yeah, that's pretty much it. I Used To Work With Turtles!
27x05	Treehouse of Horror XXVI	Homerzilla battles Gamera Note: Gamera also shows up in "Lisa On Ice" and "Thirty Minutes Over Tokyo".
27x06	Friend with Benefit	Lisa: Harper flipped a sea turtle on its back! Harper: My beach, My turtle! Lisa: Why is everything yours? Homer: Oh, why do you kids have to argue all the time? Lisa: 'cause she wants things her way instead of the right way!
27x11	Teenage Mutant Milk-Caused Hurdles	The title is obviously a reference to Teenage Mutant Ninja Turtles Bart puts various classroom pets in a candy box Skinner is about to give to the new teacher, including three turtles.
27x15	Lisa the Veterinarian	Lisa: I know that this is an especially hard time for the other classroom pets, including Mrs. Nibbles, Shelly the Turtle, Sally Mander, Hamilton Fish and Willie's chicken.
????	????	Yeah, I missed a few seasons. About this time I lost access to broadcast TV and the wiki software was broken for a while. Now I'm finally able to catch up.
28x04	Treehouse of Horror XXVII	In the segment called "Dry Hard", Springfield suffers from a drought and Apu resorts to squeezing tortoises and selling "Tortoise Water".
28x15	The Cad and the Hat	Turtle t-shirts are seen for sale in Sunblock Sam's, a shop on the Springfield boardwalk.
29x02	Springfield Splendor	Lisa: Mom, I could describe my day to you, and you could draw it for me. Marge: Okay, but I'm not very good at drawing turtle feet. So if there's any turtles, they're gonna be wearing sneakers.
29x07	Singin' in the Lane	The opening sequence is replaced with an underwater theme in which Marge's car is a sea turtle.
29x14	Fears of a Clown	Bart pulls off another prank and is brought before another judge. The judge enters with his son. Judge: Apologies! Divorced dad. *chuckle* No sitter. Bart: [mock sincerity] That must be really tough judge. I raised a turtle by myself. Pure hell! Milhouse said he'd help and he just walked away! NOTE: This episode also had another shot of the bath toy. In high definition, with the redrawing and re-shading it now looks like a strange green octopus with holes in a tentacle instead of a turtle. I'm wondering if they put this turtle line in to draw my attention to the redrawing of the bath toy...? Nah. Why would they know this page exists?
29x15	No Good Read Goes Unpunished	Bart and Homer go to war, reading The Art of War. After Homer reads that all war is deception, he pretends to be friends with Flanders, disturbing Bart. Bart: Dad, please, isn't there any way to get the old Homer back? Homer: Well now, Bart-a-ly, why would you want that balding boob *gasp* oh I said "boob"! Ned: Uh oh, time for me to do a Turtle! *pulls up sweater* I'll come out when the B-bombs stop flying. Bart: Please, I want my dad, not this horrible creature from the depths of heaven you've become!
29x19	Left Behind	Flanders comes to the nuclear plant to look for a job. As he waits, the head of human resources quits. Burns: Would you like to be the new head of Human Resources? Flanders: To quote my pet turtle, shell yes!
30x01	Bart's Not Dead	[Homer is bored with Christian heaven and runs over to Hindu Heaven] Homer: Please, send me back to Earth. Vishnu: Yes, yes. You can be a turtle or a pharmaceutical CEO. Homer: Turtle, please.
30x13	I'm Dancing as Fat as I Can	Bart stays with Milhouse, who makes him read Yertle the Turtle for a bedtime story.
30x16	I Want You (She's So Heavy)	Homer and Marge injure themselves at the end of a date. Homer lazes on the couch, listening to Wallace, his imaginary hernia, while Marge dives in to rehab at the beach. The kids realize their parents are drifting apart. Lisa: Dad, can you drive us down to the beach? I have a school project on... sea turtles. After arriving at the beach Homer: Hey, where are the turtles? Wallace the Hernia: There were no turtles Homer, it's a trick! These kids are trying to help you because they love you. Homer: So... there never were turtles? Wallace: No turtles! Homer: I'm starting to think there were no turtles!
31x22	The Way of the Dog	Episode opening titles shows pictures of departed pets, including a tortoise.
32x01	Undercover Burns	Burns destroys a pile of balloon animals, in which can be seen a few turtles
32x03	Now Museum, Now You Don't	In the segment "Lisanardo da Vinci", Lisa thumbs through an art book that shows a picture of Leonardo da Ninji (clearly a TMNT reference)
32x04	Treehouse of Horror XXXI	During the fight between the Spiderver-- I mean, Homerverse and the Burnsiverse characters, one of the characters is a Bowser-esque version of Burns.

Current count: 86 known episodes

Other Stuff

	Misc	I have a Simpsons figure of Maggie on the back of a turtle
	The Simpsons Game	In The Simpsons Game, Professor Frink stays behind to marry a Koopa Troopa. Also, level 4 has a Frogger parody with giant turtles.
2007 Movie	The Simpsons Movie	The Turtles are played in the movie. (Happy Together)
2012 Short	Maggie Simpson in "The Longest Daycare"	A drawing of a turtle is on the wall behind Maggie when it appears Baby Gerald has killed her butterfly.
	Teenage Mutant Ninja Turtles II: The Secret of the Ooze, Coming Out of Their Shells	The references go both ways. In Teenage Mutant Ninja Turtles II, the Turtles have a Bart Simpson glass in the Lair, which Professor Perry uses to mix the mutagen antidote. Also, in the Coming Out of Their Shells tour, at one point Michelangelo does an impersonation of Bart saying "Don't have a cow man".
16x17	The Heartbroke Kid	NOT a reference Bart was watching itchy and scratchy. and there was an explosion in itchy and scratchy. for a brief second you could see something that looks like a DEAD TURTLE hurled across the screen. It's just a hat from one of the bystanders.
18x05 25x22 29x14	G.I. (Annoyed Grunt) The Yellow Badge of Cowardge Fears of a Clown	The Simpsons appear to have a turtle bath toy. EDIT: In Yellow Badge of Courage it appeared to be a turtle with a pull-string in its mouth. After redrawing and reshading in Fears of a Clown, it appears in high definition to be a strange green octopus with holes in one of its tentacles.

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