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"The Lich" is the twenty-sixth episode in the fourth season of Adventure Time. It is the one hundred and fourth episode overall.
The episode begins with Finn having a dream about the Cosmic Owl screeching, Billy kissing his lady, and the bear and the snail reading the Enchiridion. At one point, while he is laughing, Billy's image flickers to the Lich and back again. Suddenly, the snail turns into the Lich and kills Billy. Then Finn wakes up. He tells Jake about his dream and Jake says it is a premonition dream. He then says they should go tell Billy because he was in the dream, turns into a car, and then drives Finn to Billy's home.
Once there, Billy yells at them saying that it's three in the morning and asks why they are there. Jake says that they wanted to make sure he wasn't dead, to which Billy asks why they would think that, and Finn proceeds by explaining 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 crystals, the group stops to rest for a bit and Jake asks Billy how many more crystals they need. Billy indicates that there is 1 left. Finn gets hungry and rummages through Billy's knapsack looking for candy, 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 cover of the book which Finn does. The circle on the front opens up showing 9 slots where all the gems go in mystically (except Lumpy Space Princess'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 blue crystal on his face to activate another hologram. A man named Booko (who bears a resemblance to Key-per and, to a lesser extent, the Door Lord) appears and explains what the first set of holograms represent, which is all the known universes and dimensions, and how they are connected. Jake tries to play around with it, but it frightens him and he calls it off. Booko goes on to mention that in the center of the universe is the Time Room where Prismo dwells. Billy states that he's going to push the Lich into there, seemingly to place the Lich in non-existence.
They then go to the Candy Kingdom to get Princess Bubblegum's crystal (she is experimenting with little creatures, cutting off their legs and reattaching them) and Finn breaks through the roof, failing at trying to do so quietly, and after regaining himself, asks for the crystal on her crown. Princess Bubblegum is shocked and refuses, forcing Finn to grab it without explaining why, during which, Princess Bubblegum accidentally slices Finn's cheek with the scissors she is still holding from her experiments. They stare at each other for a brief moment, both stunned, and Princess Bubblegum says "That was an accident." Finn removes the gem from her crown, drops the crown and is grasped by Jake who stretches out of the room from the hole Finn made when he fell in. Finn and Jake run off with the gem with Princess Bubblegum not far behind who has taken the stairs. Once outside, he then puts it in the final slot and the book's pieces start to fall off as the Enchiridion turns black (or to some rock-looking substance) after the pieces of the cover slide off and/or illuminate. Princess Bubblegum 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 Billy's face, and showing the Lich's true face. The Lich then 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 him, reacting to Princess Bubblegum's request, and stretches as to not go through. Jake, though, is slowly being dragged into the portal as the ground under him gives way. Finn tries to stop Jake from getting pulled in but instead is pulled in with him. The scene changes to a boy (who is called Finn) who looks and sounds similar to the Finn (but looks like the version of him from the floor mirror in "King Worm," with a robotic arm, a nose and white eyes with black pupils), from the Land of Ooo, playing his flute with a regular dog who looks just like Jake, then his mother (who shall, for now, be referred to as "Finn's mother") calls him in for what she says is "something important" and the episode ends as he heads inside with his dog towards a small house with a barn next to it.
- Finn's mother
- Farmworld Finn
- Farmworld Jake
- Ice King
- Engagement Ring Princess
- Emerald Princess
- Lumpy Space Princess
- Embryo Princess
- Hot Dog Princess
- Gumball Guardian
- There are a few clues within the show that foreshadow Billy's possession by the Lich:
- During Finn's dream, when Billy is laughing he switches to the Lich in one frame then back.
- Billy never physically touched the gems, and refused when Finn tried to hand one to Billy.
- Billy had said he found the Enchiridion in the mouth of a bear, yet the viewer knows that it was directly delivered to the Lich.
- Billy was unable to speak to Jake while he was using his head as a gem holder. As seen in the Lich's original appearance, the Lich cannot communicate with anyone wearing a magical gem on their head.
- When one thinks that the dream of Finn has been true the Lich went into the heart of Billy, he was already possessing him.
- Lumpy Space Princess' royal star gem was the only stolen gem not needed to unlock the Enchiridion; it simply bounced off of the book cover and fell to the side.
- In Finn's dream, when the Lich goes in Billy's body, he goes through his heart located beneath Billy's beard.
- In the portal, a shred of land appears to be in the shape of Texas.
- When Jake enhances the hologram on the map of the multiverse on their dimension, Earth (with its chunk missing) is shown as the second planet from the sun and not the third.
- The Latin phrase that Billy chants to activate the Enchiridion's holographic multiverse map is "Ex Hibio Conatum", which translates to "Prohibits the Attempt," although alternatively, Billy may have said "Exhibio Conatum", which translates to "Retorted Attempt."
- Several of the gems don't match any known characters, including a deep blue, yellow, and violet gem.
- Both Hot Dog Princess and Embryo Princess have a red gem, though only one was used for the Enchiridion.
- The strap on the Farmworld version of Finn's chest is brown instead of green like it was in "King Worm."
- 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 a series of famous tapestries known as The Hunt of the Unicorn.
- When Booko talks about "items of great power," a hologram of someone who greatly resembles Bloo from the Cartoon Network show Foster's Home for Imaginary Friends holding a paddle ball is shown.
- The monitor that Finn is looking at in his dream has a similar appearance to an iMac G3.
- On the Enchiridion's lock appears J.R.R. Tolkien's elven alphabet.
- During the dream, a page of the Enchiridion flies in front of Billy's face; it was the first page of chapter five (How to Kiss a Princess), which was seen in "The Enchiridion!"
- 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."
- The strange-looking Finn appears when Finn looks in the mirror in "King Worm."
- Booko resembles the Key-per from "The Enchiridion!" and the Door Lord from "What was Missing."
- The flute that Finn is playing in the alternate universe at the end of the episode is also seen in "Prisoners of Love."
- Though Billy is normally seen to have 6 fingers on a single hand, he has 7 fingers when he picks Finn up to ask if he's ready for the next adventure. Strictly speaking, this might be not an error. Since Billy was impersonated by the Lich in this episode, him having 7 fingers might be due to the Lich's mistake.
- When Finn realizes that Billy is the Lich, Jake's nose is the color of his fur.
- The scene where Finn tries to rummage around inside Billy's saddle bag is the only scene in the episode where Billy is actually wearing it.
- When Princess Bubblegum reattaches the little creature's limbs for the first time and sets him down, his right arm is missing.
- When Finn is running up to grab Jake, his cut is missing for a couple of frames, but then reappears.
- The Gumball Guardian isn't seen sitting on the candy wall.