What is Life?

What is Life? is episode fifteen in season one of Adventure Time with Finn and Jake.

Synopsis
When Jake pranks Finn, Finn decides to prank Jake back by creating a robot that throws pies. The robot, however, has a few problems, and Finn goes to Ice King's lightning storage to give NEPTR (short for Never-Ending Pie Throwing Robot) what he needs. But NEPTR develops some of Ice King's personality and he has to choose between pranking with Finn or capturing princesses with Ice King.

Plot
While Finn is playing video games, Jake shows up with a big trash-bag and throws it at Finn, showing that the bag was full of butter. Finn wants to get back at Jake and decides to build a robot that will throw pies at Jake, who then takes a nap. But the robot doesn't work and Finn throws it out, but then it comes to life by a lightning bolt. The robot calls Finn its creator and introduces itself as NEPTR, short for Never-Ending Pie-Throwing Robot. As Finn is ready to prank Jake, he realizes that NEPTR has problems, and decides to help his robot by going to the Ice Kingdom to get more lightning bolts from Ice King.

Finn and NEPTR get to the Ice Kingdom by Balloons, who are revealed to be grade-A pranksters. They sneak through Ice King's castle while he is talking to one of his penguins named Gunter and playing video games. However, they trigger Ice King's alarm and are being chased by an Ice Bull. Finn and NEPTR make it to Ice King's lightning bolt storage, but it gets destroyed by Ice King and his Ice-o-pede. As Ice King is going to strike lightning on Finn, the blast hits NEPTR and he gains his full capacity. NEPTR throws pies at the Ice-o-pede and he and Finn escape on the Balloons, but begins acting strange. Ice King notices it too and follows them back to Finn's home.

When Finn gets NEPTR ready to prank Jake, NEPTR says he wants to capture princesses instead. Finn gets concerned about NEPTR's new behavior and when he opens the door, Ice King is there and kicks Finn away, then freezes him. Ice King decides to raise NEPTR as his son, revealing that Ice King's lightning blast gave NEPTR some of his personality. Ice King then takes NEPTR, along with Finn who uses his free hand to go with them, to Ice King's imagination zone, where he shows NEPTR all the beautiful princesses he can capture if he decides to be his son. They go back to the real world, and Finn breaks out of his frozen imprisonment, then fights Ice King. After a short battle, they both decide that they should let NEPTR choose who to be with. NEPTR chooses Ice King, but reveals that he only choose Ice King to prank on, and throws pies at Ice King, knocking him out. Finn and NEPTR then leave Ice King to go prank on Jake, and Ice King dreams of him and NEPTR standing in the sunset, dreaming that NEPTR is his son.

Characters

 * Finn
 * Jake


 * Neptr


 * Balloons
 * Ice King
 * Gunter
 * Ice Toads
 * Ice Bull
 * Ice-o-pede
 * Video Game Girl
 * Video Game Frog
 * Video Game Flies
 * Ghost Princess (In Ice King's imagination)
 * Muscle Princess (In Ice King's imagination)
 * Princess Princess Princess (In Ice King's imagination)
 * Engagement Ring Princess (In Ice King's imagination)
 * Emerald Princess (In Ice King's imagination)
 * Princess Bubblegum (In Ice King's imagination)
 * Wildberry Princess (In Ice King's imagination)
 * Lumpy Space Princess (In Ice King's imagination)

Trivia

 * This episode was originally called Ice King and Son.
 * The Balloons who made their debut in Ricardio the Heart Guy are grade A pranksters.
 * This is one of the only times Jake is not a main character.
 * While Finn is building Neptr, he sings without being autotuned.
 * All of the princesses appear in this episode, but only in Ice King's Imagination Zone.
 * Apparently Jake talks in his sleep.