The Lich (episode)

Synopsis
Finn is lead by Billy to a quest to save the world and beyond from The Lich.

Plot
As Finn is having a dream about the Cosmic Owl screeching, Billy kissing his lady, and the bear and the snail are reading the Enchirideon and the snail kills Billy and Finn wakes up and Jake tells him about his dream and he says its a premonition dream. He then says they should tell Billy because he was in the dream and then drives Finn to Billy's Crack where Billy yells at them saying that its 3 in the morning and Finn tells him about the dream and Billy asks them if they want to save all life from the Lich and they agree. After they head out, Billy tells them that they need to collect all the magical gems from all the princesses and Ice King's power crystals that protect them from the Lich and half-way through Jake asks Billy how many them need and Billy tells them 1 but Finn rumages through Billy's knapsack finding the Enchiridion and asking why he had it. Billy says that he found it in the mouth of a bear and Finn blushes with embarassment as he remembers giving the book away and Billy says it has magical powers and tells him to turn the sword on the front and as Finn does, the circle on the front opens up showing 9 slots where all the gems go in mystically (except LSP's whom just falls over the book) and shows a brief diagram about what would happen if all the slots where filled and they go to the Candy Kingdom to get PB's crystal (she is experimenting with little people, cutting off their legs) and Finn breakes through the roof and Finn asks for the crystal but PB says no and Finn trys to grab it, but as he gets her crown, PB 'accidentaly' slices Finn with the scissors on his cheek and she swears it was an accident, but Finn runs off with gem and puts it in the final slot and the book turns black, but PB runs out telling Finn that Billy is really the Lich and not to give him the book, so one of the Gumball Guardians gets up and blasts Billy,revealing half of his true face (the Lich) and he asks for the book, but Finn smashes it and accidentally opens up a wormhole. The Lich tries to go through but Jake and Finn grab him but are dragged in. The episode ends with Finn and Jake in an alternate dimension with Finn shown playing his flute with his vision from the mirror in King Worm with a mechanical arm and pointed nose, and Jake appears to be a regular dog that cannot speak, but Finn's mother calls him in and the episode ends mysteriously.

Major characters

 * Finn
 * Jake
 * The Lich (Billy)
 * Princess Bubblegum

Minor characters

 * Finn's Mother
 * Ice King
 * Engagement Ring Princess
 * Emerald Princess
 * Lumpy Space Princess
 * Embryo Princess
 * Bear
 * Cosmic Owl
 * Snail

Trivia

 * This is the finale for Season 4
 * This is the second episode with a cliffhanger ending, the first being "Incendium".
 * During Finn's dream, when Billy is laughing he switchs to the Lich in one frame then back,hinting on the Lich's disguse.
 * Finn's mom in the alternate universe is wearing a wedding ring, hinting that Finn has a father in the alternate universe as well.

Episode connections

 * When Finn mentions the Cosmic Owl was in his dream, Jake claims it was a premonition dream, similar to his own in "The New Frontier."
 * This is Billy's first reappearance since "His Hero."
 * The strange-looking Finn appears when Finn looks in the mirror in "King Worm (episode)."
 * Finn's Mother appears in the alternate world at the end of the episode. She appears to have similar clothing as Princess Bubblegum.
 * In the alternate universe Finn has a mechanical arm just like the one he invisioned on himself in breifly in earlier episodes.

Videos
Adventure Time - The Lich (short preview)|Short preview. Adventure Time - The Lich (long preview)|Long preview. "The Lich" Animatic|The animatic. http://www.youtube.com/watch?v=emZ4diX3oKI