The Lich (episode)

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

Plot
Finn is having a dream about the Cosmic Owl screeching, Billy kissing his lady, and the bear and the snail reading the Enchiridion. Suddenly, the snail kills Billy and Finn wakes up. He tells Jake about his dream and Jake says it is a premonition dream. He then says they should tell Billy because he was in the dream and then drives Finn to Billy's Crack.

Once there, Billy yells at them saying that its 3 in the morning, but Finn tells him about the dream. 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.

After some time spent collecting cystals, the group stops to rest for a bit and Jake asks Billy how many more crystals they need. Billy tells them 1 is left, but without speaking. Finn gets eager and rummages through Billy's knapsack, finding the Enchiridion after being smacked 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. Billy says it has magical powers and tells him to turn the sword on the front of which 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 his head to activate another hologram. A man named Book-o appears and 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 Prismo dwells. Billy mentions that he wants to push the Lich into there, seemingly to place the Lich in non-existence.

They then go to the Candy Kingdom to get PB's crystal (she is experimenting with little creatures, cutting off their legs and reattaching them) and Finn breaks through the roof and asks for the crystal on her crown. PB is shocked and refuses, and Finn tries to grab it by force, during which PB accidentally slices Finn's cheek with the scissors she is still holding.They stare at each other for a brief moment, stunned, and PB says "It was an accident". Finn hisses, picks up the gem and runs off with it. He then puts it in the final slot and the book's pieces start to fall off as the Enchirdion turns black. PB runs out telling him that Billy is really the Lich and not to give him the book.

Just as she says this, one of the Gumball Guardians gets up and blasts Billy, detecting the Lich's presence, thus revealing half of the Lich's true face. The Lich the asks for the book. Finn realizes that the Lich "messed Billy 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 him, 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, then 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 fifth episode with a cliffhanger ending, the first is "Mortal Folly," the second being "Incendium," the third being "Hug Wolf", and the fourth is "Return to the Nightosphere."
 * During Finn's dream, when Billy is laughing he switches to the Lich in one frame then back.
 * Finn's mom in the alternate universe is wearing a wedding ring.
 * On the back of the Enchidirion, you can see three numbers from the Fibonacci sequence. Furthermore, adding all the numbers together equals "42," which is the so-called answer to "The Question of Life, the Universe, and Everything" from Douglas Adams's "The Hitchhiker's Guide to the Galaxy."
 * 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 suggested 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.
 * The tapestry with the unicorn in Finn's dream is based on "The Unicorn is in Captivity and No Longer Dead" which is part of "The Hunt of the Unicorn", a serie of famous tapestries. The four dogs in the cave could be same as the one on "The Hunters Enter the Woods" tapestry.

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)."
 * The concept of Finn having a prosthetic arm has also previously arisen in Who Would Win, Mortal Folly, and Adventure Time (comic).


 * The bear returns for the first time since "In Your Footsteps"
 * Book-o resembles the Key-per from "The Enchiridion"and the Door Lord from "What was Missing?".
 * The flute that Finn is playing in an alternate universe at the end is also seen on "Prisoners of Love." Although the flute looks more damaged before Finn throws it, which causes it to break.

Errors
They forgot flame princess

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