Stretchy Powers

Stretchy Powers are the powers that Jake the Dog and Cake the Cat use to change the shape of their bodies. Jake has been seen to use a variety of Stretchy Powers. Jake claims that he thought he might have gotten them by rolling around in a mud puddle when he was still a pup, as stated in the episode, "The Witch's Garden," but Pendleton Ward stated on Formspring that this wasn't how he got his powers, and that Jake just "couldn't remember." With the many abilities that Dogs in this world all seem to possess, it is possible he was born with them and that the "rolling in the mud" excuse was just due to not knowing fully himself, or his own bad memory. Pen Ward also said that Jake doesn't know the full use of his powers because he was too lazy to use them fully until "The Limit." Jake can also grow his entire body to accommodate multiple riders, as seen in "Prisoners of Love," and shrink so that Finn can hold him and fit in his pocket, as seen in "It Came from the Nightosphere." Jake's also been shown to completely morph the shape of his body into various other structures (in the episode "Loyalty to the King," Jake makes an ear shield so he and Finn can get by the princesses, and in Return to the Nightosphere he changes shape to resemble a demon), harden/sharpen parts of his body (Beautopia showed Jake transforming his hand into a pickaxe to pop one of the Lub Glubs' false pool-floaties), and many other general transformations that are usually applicable to the situation at hand.



Notable forms
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Key Hand
Key Hand is a unique ability that is only known to be used by Jake. Key Hand consists of Jake morphing his hand into the shape of a skeleton key. Since Jake is a magical dog, he is the only known person in the Land of Ooo who can do this. This is very helpful when trying to open doors, prison cells, gates, and other obstacles that require the use of a key.

Key Hand is first seen in the episode "Prisoners of Love." Jake attempts to use Key Hand to free all the princesses who were locked in Ice King's jail cell. Ice King realizes that Key Hand was a threat and quickly flash-freezes Jake.

In the episode "Dungeon," Finn tries to use Key Hand to open a locked door, but without Jake's stretchy powers, he only hurts his fingers. When he is reunited with Jake, both are trapped in a cage by the Guardian Angel. Jake morphs his hand to make Key Hand; however, Finn doesn't see any locks. So Jake morphs his other hand into "Lock Hand." So far, Jake has been seen to use the Key Hand twice and failed.

In the game Legends of Ooo, Jake uses Key Hand so he and Finn could escape the ice dungeon after dressing up as a princess. This is the first time Jake is "seen" using Key Hand with any form of a successful result.

Trivia

 * Notably, Jake's mass appears to reduce with his size; when he is small, he is lighter than normal, and when enlarged, he becomes heavier.
 * Jake can be stretched by force as seen in "Ocean of Fear," where Finn stretched Jake's ears to avoid making contact with the ocean, and in "Beautopia," when Susan stretches him into an oar. It's also shown in "Hot to the Touch," where Finn was able to morph Jake's face around freely.
 * There is an upward limit to Jake's Stretchy Powers, for if he exerts himself too much he could die, as seen in "The Limit." This is because his body stretches like a piece of bubblegum, as the more he stretches, the thinner he gets, until it becomes difficult for his organs to function. However, in "From Bad to Worse," he tells Lady Rainicorn he can stretch forever.
 * Stretchy powers are the most seen and used ability in the series, appearing in almost every episode, thanks to Jake being the second protagonist.
 * Jake's gender-swap (and species-swap), Cake, also has stretchy powers.
 * He can also increase the size of his organs, such as in "Jake vs. Me-Mow" he grew his liver 51 times its normal size to filter out the poison in his body.
 * Jake also seems to have an amount of control over his bodily functions, as he could transfer all his blood and internal organs into his thumb in "Evicted!" to prevent Marceline from sucking his blood.
 * While it has not been seen in the series, Jake is seen having the ability to fly by using his stretchy powers to turn his ears into bird-like wings in the Cartoonnetwork.com game, "Righteous Quest," as well as the sequel "Righteous Quest 2."
 * In the episodes "Business Time" and "The Pods," it is shown that no matter how much Jake eats, he can still stretch back to normal size.
 * Jake can also change the shape and quantity of his teeth, as shown in "Daddy's Little Monster" when he shape-changed into a demon.
 * In "Goliad," it is shown that he can forcibly expel people from his body by holding his breath and making them "pop" out of his body.