The Lich (episode)

Synopsis
Finn is lead by Billy on 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 more crystals they need and Billy tells them 1 is left, but without speaking. Finn gets eager and rummages through Billy's knapsack, finding the Enchiridion after being smaked out by Billy and asking why he had it. Billy says that he found it in the mouth of a bear and Finn blushes with embarrassment as he remembers giving the book away to the bear 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. At first, Jake and Finn wonder what all the holograms are, but Billy uses the crystal on he possesses to activate another hologram of Book-o who explains what the first set of holograms represent, the universes and how they are connected. Jake tries to play around with it but it frightens him and he calls it off. Book-o goes on to mention that in the centre of the universe is the Time Room where Quiz-mo dwells. Billy mentions that he wants to push the Lich into there, seemingly to place the Lich in non-existence. And they go to the Candy Kingdom to get PB's crystal (she is experimenting with little people, cutting off their legs) and Finn breaks through the roof and Finn asks for the crystal on her crown. PB says no and Finn tries to grab it by force, during which PB drops the crown, and as he recovers her crown, PB 'accidentally' slices Finn with the scissors on his cheek and she swears it was an accident. Finn hisses, picks up the gem and runs off with it. Finn puts it in the final slot and the book's pieces start to fall off as the Enchirdion turns black. 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 being alerted to the Lich's presence,revealing half of his true face (the Lich) and he asks for the book. Finn realizes that the Lich "messed Bily up" and after dodging a grasp from him smashes the book with his knee. But that action accidentally opens up a wormhole, to which the Lich is pleased and thanks Finn, tauntingly. As the Lich tries to pass through, Jake grabs the Lich, reacting to PB's request, and stretches as to not go through. Jake, though, is slowly forced into the portal as the ground under him gives way. 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)

Minor characters

 * Finn's Mother
 * Ice King
 * Princesses
 * Princess Bubblegum
 * Engagement Ring Princess
 * Emerald Princess
 * Lumpy Space Princess
 * Embryo Princess
 * Hot Dog Princess

Dream characters

 * Bear
 * Snail
 * Old Lady
 * Cosmic Owl

Trivia

 * This is the finale for season four.
 * This is the Third episode with a cliffhanger ending, the first being "Incendium" second is "Return to the Nightosphere".
 * During Finn's dream, when Billy is laughing he switchs to the Lich in one frame then back, hinting on the Lich's disguise.
 * It was hinted that Billy was the Lich in disguised, because he had the Enchiridion, which he got from the bear.
 * Finn's mom in the alternate universe is wearing a wedding ring, hinting that Finn has a father in the alternate universe as well.
 * On the back of the enchidirion, you can see a date. However, adding all the numbers together equals "42". The so called "Answer to the Universe".
 * Lumpy Space Princess' royal star is revealed to work similar to the gems on the crowns of all Ooo royalty but may not work with the Enchiridion's gem door due to being based out of Lumpy Space instead of Ooo. It is unknown if it protects LSP from the Lich's mental control like the other gems.
 * Finn's neck is thicker than it is in other episodes his hat was taken off in.
 * It is shown that Jake can't talk in the alternate universe when he and Finn run to the farm house.
 * The computer that Finn is looking at in his dream has a similar appearance to an iMac G3.
 * It is possible that the alternate universe at the end of the episode is the one that we live in, where the Mushroom War never became a nuclear holocaust. This is because there is no sign of a nuclear holocaust or mutated creatures.

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)."

Videos
Adventure Time - The Lich (short preview)|Short preview. Adventure Time - The Lich (long preview)|Long preview. "The Lich" Animatic|The animatic.