|Introduced in||"Slumber Party Panic"|
The Snail is a character that hides in all episodes, usually seen waving at the screen. His cameos are a running gag. In the episode "Mortal Folly," the Lich possesses him to break the Lich free. However, in "Mortal Recoil," Princess Bubblegum (possessed), passes the Lich into him.
While the Snail was just a running gag at first, he eventually became an integral part of the story when he released the Lich in the episode "Mortal Folly." The Snail comes out of Finn's bag to wave to the viewers, but then falls under the Lich's mind-control spell and breaks the amber prison by bashing it with his head. He appears at the end of "Mortal Recoil," still being controlled by the Lich.
At the end of "In Your Footsteps," the Snail speaks for the first time and gains The Enchiridion. The Snail still continues to appear in each episode, and (when examined closely) appears to still have green eyes and an evil expression on its face. The possessed snail was voiced by Pendleton Ward.
The tables below list the Snail's known whereabouts.
|Slumber Party Panic||On top of a Candy Person's head.|
|Trouble in Lumpy Space||According to Pen's Formspring, they dropped the ball on this episode, and the original airing of the episode went without them putting the Snail. They claimed they would add the Snail in for reruns. The snail is now seen behind lumpy Jake on a streamer at prom-coming just after Finn falls through the building.|
|Prisoners of Love||Next to Slime Princess when she says, "Yay!" This is the first close-up of the Snail.|
|Tree Trunks||On Tree Trunks' picnic blanket.|
|The Enchiridion!||Next to Princess Bubblegum when Finn saves her from hitting the ground.|
|The Jiggler||In the red liquid next to the mama Jiggler during a close-up.|
|Ricardio the Heart Guy||On the dance floor nearby Slime Princess.|
|Business Time||On the Gauntlet Dock when the Businessmen are working on it.|
|My Two Favorite People||On the lake shore behind Finn.|
|Memories of Boom Boom Mountain||On a table next to Jake.|
|Wizard||On the stage right after "LEVEL 31!"|
|Evicted!||Three times during the House Hunting Song as Finn and Jake walk towards the camera (akin to the repeated appearance of background as characters walk by it as used as a method for animating less). This episode shows the Snail the most number of times.|
|City of Thieves||Jake makes a snail-shaped imprint on his belly shortly after meeting Penny. It is seen when he turns back around. It was made after he was trying to make a shape out of his belly.|
|The Witch's Garden||On the grass next to the Two-Headed Goose when the Tree Fort is first shown.|
|What is Life?||On the floor after Ice-o-pede attacks Ice King.|
|Ocean of Fear||On the wall of the ruins in the middle of the ocean that Finn flies to using Jake's ears.|
|When Wedding Bells Thaw||By the back of the Tree Fort when Ice King is wondering if he's at the right address.|
|Dungeon||Pops up very briefly when Finn falls into the soup inside the cage. He might have fallen out of Finn's pack.|
|The Duke||By the tree when the Duke of Nuts lays down his cape for the family of ducks/quails. Also on the newspaper when the Squirrel looks through the articles.|
|Freak City||On the bridge when the Rump People throw Finn under it.|
|Donny||On the left side of the screen when Donny was squeezing eggs out of the chickens at the barn person.|
|Henchman||Under the Duke of Nuts' chair when he says, "Oh, how wonderful!"|
|Rainy Day Daydream||Beside Finn and Jake when they're talking to BMO.|
|What Have You Done?||On the floor next to Ice King's bed.|
|His Hero||Hiding behind the gruel pot after Cobbler confronts Finn about the stone-skin potion filled gruel.|
|Gut Grinder||On the ground when the mayor of the Spiky People is thanking Finn.|
|It Came from the Nightosphere||A spirit version of the Snail appears in one of Marceline's Father's soul sacks near Lumpy Space Princess.|
|The Eyes||Is visible very briefly when Jake is talking about capturing the bandito.|
|Loyalty to the King||Very briefly appears near the door when Lumpy Space Princess first enters the "Nice King's" room.|
|Blood Under the Skin||This episode began with no snail appearing in it. However, they have added in a snail in the Swamp of Embarrassment at the base of the tree next to the woman and her baby showering who call Finn a pervert.|
|Storytelling||On the leaf falling down by the tree house, and also on the leaf when it lands in the forest. This is the second time the Snail was seen clearly on the show, but it was the first time he was used in the plot.|
|Slow Love||By the bottle on the table next to Finn and Jake while they demonstrate to Snorlock how to talk to the ladies.|
|Power Animal||On the broken TV next to the Nymphs while Jake is walking up to them.|
|Crystals Have Power||By the table when Finn walks up to the crystal while it's glowing.|
|The Other Tarts||In the window when Cinnamon Bun says, "Hey!"|
|To Cut a Woman's Hair||Next to Finn when he screams after he looks at Princess Beautiful.|
|The Chamber of Frozen Blades||On the ground when Finn puts on his sweater outside the Ice King's castle.|
|Her Parents||On the table when Ethel and Bob talk with Jake.||124px|
|The Pods||On top of the small house built by Finn, Jake, and the pigs.|
|The Silent King||In the background when the thief is stealing hot buns.|
|The Real You||Under the grill when Princess Bubblegum dumps coal on it.|
|Guardians of Sunshine||In the entrance of the Tree Fort when the Guardians of Sunshine monsters escape and push Finn and Jake out of the house wall.|
|Death in Bloom||Behind the house in Veggie Village.|
|Susan Strong||Standing by the garbage where the hyoomens are hiding.|
|Mystery Train||In the kitchen on the floating light in the train.|
|Go With Me||Inside the windscreen of the wrecked bus at the movies.|
|Belly of the Beast||Just to the right of the DJ Bear the first time he appears on-screen and he is between DJ Bear and a bent down green bear.|
|The Limit||On the pile of rocks on the left side of the screen when Jake is moving the block into the hole.|
|Video Makers||In the tree on the right side of the screen right before Finn warns Slime Princess not to fall into the water.|
|Mortal Folly||The Snail makes a prominent appearance emerging from Finn's backpack, becoming possessed by the Lich and freeing him from his amber prison.|
|Mortal Recoil||The Snail appears in the episode title card and in the final scene of the episode, still possessed by the Lich.|
|Heat Signature||The snail appears only once; the object mistaken for the snail when Marceline is teaching them to walk like vampires is just an aluminum can. The snail is in the background behind a tire as Finn and Jake are trying to scare Lumpy Space Princess because they think they're invisible.|
In season three, the snail is still possessed by the Lich in every cameo appearance.
|Conquest of Cuteness||In hut in the background when BMO is taking pictures of the Cuties.|
|Morituri Te Salutamus||In the rocks on the right side of the screen when Finn and Jake first enter the Arena.|
|Memory of a Memory||Hanging upside-down from the top of a lamp in Marceline's house when she is first found.|
|Hitman||On the stump that Finn and Jake trip over. Potentially the third time the snail has influenced the plot, as it is somewhat implied the lich-possessed snail caused them to trip.|
|Too Young||Behind the dancing blue candy citizen.|
|The Monster||In the field, when Lumpy Space Princess emerges from the windmill and gets called a "monster."|
|Still||On the top of a door frame when Ice King and Gunter fight with the bottle.|
|Wizard Battle||In the Grand Master Wizard's sleeve when he's playing with his cat.|
|Fionna and Cake||On the ceiling, when Prince Gumball is decorating it with Jelly Kinders|
|What Was Missing||On Marceline's stove, on the handle of a pot.|
|Apple Thief||On the stool behind the angry cookie guy in the Candy Tavern.|
|The Creeps||On the stairs in the background.|
|From Bad to Worse||In the window all the way to the right, right after the zombies get flying powers from Finn's antidote.|
|Beautopia||On the back of the chair as Finn chants "Hazelnut!".|
|No One Can Hear You||On a garbage heap.|
|Jake vs. Me-Mow||Near the dead bull.|
|Thank You||On a tree branch when the snow golem's walking to gather fruit.|
|The New Frontier||On the door of the ship.|
|Holly Jolly Secrets Part One||On the hill.|
|Holly Jolly Secrets Part Two||The Snail prominently appears as a non-cameo minor character. He is shown when Shelby says his name and continues to appear at the end during shots of the gang.|
|Marceline's Closet||Near the ladder.||120px|
|Paper Pete||On the top left table.|
|Another Way||On the rim of the bridge.|
|Ghost Princess||Next to the corpse of "some donkus".|
|Dad's Dungeon||On the boat.|
|Incendium||On the painting on Finn's wall.|
In season 4, the possessed snail is still making cameo appearances, but it played a major part in the episode, "In Your Footsteps."
|Hot to the Touch||Behind the box at the moment that NEPTR is singing.|
|Five Short Graybles||When the Ice King is washing off Gunter's stench.|
|Web Weirdos||On the web next to Ed after Jake is tied up. In the TV episode, the Cartoon Network logo covers the snail up.|
|Dream of Love||On the ground next to the Pig during his song solo.|
|Return to the Nightosphere||Near Hunson Abadeer's statue in the prison.|
|Daddy's Little Monster||Under some demons in line as Finn and Jake enter the room with Hunson Abadeer (Marceline), just before running into the Line Demon.|
|On the ground with the partying Candy People at the beginning of the episode. He also appears, possessed by the Lich, at the end of the episode, taking the Enchiridion from the Bear.|
|Hug Wolf||In the doorway of the tower behind Finn and Jake when they start picking up candy litter.|
|Princess Monster Wife||Between Bubblegum and Lumpy Space Princess when they go to talk to Finn and Jake.|
|Goliad||On a shelf in the preschool.|
|Beyond this Earthly Realm||On pedestal.|
|Gotcha!||Next to Finn when Lumpy Space Princess looks out the window and Finn is alone sitting on the log.|
|Princess Cookie||On top of the couch in the orphanage.|
|Card Wars||On top of the stove.||124px|
|Sons of Mars||Top left corner in Magic Man's house when Finn and Jake crash.|
|Burning Low||Up in the door frame.|
|BMO Noire||On the stepping stone outside the house.|
Appears on shelf near end when Finn says, "Get out of our house, King Worm!"
|Lady & Peebles||In the igloo when Princess Bubblegum says, "Let's roll."|
|You Made Me!||In the security room right beside the banana guards.|
|Who Would Win||The snail is seen when Finn is jump roping with Jake.|
- The Snail's eyes are below where an actual snail's eyes are.
- The Snail is the only snail of his size that has appeared in the show. Other snails have been shown, but they were much larger.
- "Storytelling," "Mortal Folly," "Mortal Recoil", and "In Your Footsteps" were the only episodes in which the snail was featured as part of the story.
- Finn, the Lich, the Bear, and Shelby are the only characters who have noticed or interacted with the snail.
- Multiple times in the third season, the Snail appears normal and not possessed by the Lich.
- "Holly Jolly Secrets Part Two," "Ghost Princess," "Dad's Dungeon," "Princess Monster Wife," and "Who Would Win" all have had the snail in the preview.
- The Snail appeared in the title card of "Mortal Recoil."
- The snail was not originally in two episodes ("Trouble in Lumpy Space" and "Blood Under the Skin"), but it was added in to both episodes before reruns aired.
- In "His Hero," and "Wizard Battle" only his shell is shown.
- Similar recurring, hidden characters in other media include:
Appearance in other media
- In the game Righteous Quest 2, the snail appears a couple times in the game.
- The Snail starred in its own FusionFall game: "Snail Quest."
- The game Legends of Ooo uses snails as hints. Also, a slimy snail is used to free Slime Princess.
- Issue 1 of the Adventure Time comic series begins with the Lich-controlled snail entering the Bag of Holding, which somehow allows the Lich to return to his old body.
- In Issue 3 of the Adventure Time comic, the Snail makes two cameo appearances on top of a Snow Finn's head.
- In Issue 4, the Snail appears in the background when Princess Bubblegum is thanking Finn, and is also seen on Marceline's lifeguard chair in the panel after the Great Mushroom War comic is shown.