The episode opens up on the Castle Lemongrab. Inside, Lemongrab and his lemon citizens are being served lemon candies for dinner. After Lemongrab commences dinner, he and his citizen eat one spoonful of the lemon candies and dinner is concluded with a clap. Lemongrab says, "Up." and is lifted then passed across by a chain of lemon citizens to a window. As Lemongrab looks out the window, we see different looking lemon citizens doing specific tasks. They include harvesting, smashing, picking and planting lemon seeds. One citizen is seen using pulp from a lemon to make a statue of Lemongrab.
After he finished surveying, Lemongrab shouts, "Lights Out!", and the lemon citizens stop what they're doing and collapse into sleep. The scene moves to the Earl's bedroom as he carried into his bed by the citizens. As he's in bed, lemon citizens up a catchers mitt on his right hand and place bag of lemon seeds on a nightstand beside him. While awake, the Earl gazes up, with a puzzled look, at an archaic picture drawn on the ceiling. Lemongrab realizes that something strange is happening to the scene, and shortly afterward a piece of it falls out. Lemongrab becomes irritated by this, and, grabbing the lemon seeds on his nightstand, he gets on his lemon camel and leaves Castle Lemongrab. As he leaves, he curtly exclaims "Bye!" to lemon citizens guarding the castle gate, and they immediately fall asleep after closing it.
The scene transitions to Finn and Jake camping out on a mountain at night. Finn tells Jake to hurry and finish heating his cocoa on the campfire so he won't miss the "Dap of the Heavens." Finn looks through a telescope and we see two stick-figure constellations hands' begin to shine as their hands "dap" each others'. Jake stretches to where Finn is and Finn informs him that he missed it and how is was actually "a little disappointing." Jake then begins to hear noise and Finn looks through the telescope to see Flame Princess and Cinnamon Bun rehearsing a dance routine. Finn, crest fallen, asks Jake if he meant Flame Princess. Jake corrects him and points to Lemongrab, on his lemon camel, heading for the Mountain of Matthew. Finn decides to follow Lemongrab. Jake asks him why and he responds that Lemongrab may be, "messing with crazy mystic power" and that "he needs to distract himself with work since he saw Flame Princess." Jake then stretches into a hanglider and flies Finn to the entrance of the Mountain of Matthew. Finn spots Lemongrab's lemon camel and dashes inside. Jake tries to follow him but a mass of white rocks on the ground of the entrance suddenly forms into a big pile, blocking Jake by forming into an obstacle each time he tries to get through. Jake is perturbed by this, but the Guardian of the Mountain tells him that "he has no beeswax in the Mountain of Matthew.." but that Finn has "way cray beeswax." Finn continues without Jake and the scene moves to the caves below the Mountain of Matthew.
The Earl goes on an introspective journey, seeing his greatest desire (to be accepted by his "mother" Bubblegum), his worst fear (Lemonhope taking over his kingdom and solving the ills that he, Lemongrab, once wrought), and his past selves, Lemongrab 1 and 2, arguing over Lemon-Sweets. Lemongrab chooses Lemon-Sweets, though he grows smaller and smaller. He jumps into Lemon-Sweets open mouth. Lemongrab slides down until he finds himself surrounded by darkness, but laying on top of a greasy yellow surface he finds unpleasant. The surface tips suddenly and Lemongrab falls, grabs the edge just in time, and is left dangling above the void. Lemongrab shakes his fist as he curses the circumstances. After he does, a disembodied voice tells him to taste the grease, then to look up. He looks up to see himself, staring back at himself. He then incredulously asks, "I am grease?"
Finn who is now facing the same ordeal. He has to choose either to dance with Flame Princess as Cinnamon Bun, go to his Tree House where Jake just made Finn cakes, or to join one of his past lives, a butterfly.
The scene is now on tiny Lemongrab as he is saying goodbye to Lemongrease (Lemongrab). Lemongrease asks where tiny Lemongrab is going to and tiny Lemongrab tell him that, "..to only where my pure essence can go."
Finn as hears tiny Lemongrab ejecting his pure essence out of the top of his head. Finn chooses his past self, the butterfly, and it flies him to a fleshy looking area and begins to run. Finn realizes that he running on his arm and is now tiny in comparison to the arm of himself that he is running on. Finn is surprised by this which makes his tiny self, bigger self (that is tiny self is running on), and a now even tinier self that is running on Finn's tiny self's arm. Finn's tiniest self then runs off of his tiny self's arm and into blackness running towards a light in the distance.
Finn reaches the light, were we can see Lemongrab and they are both now wearing white robes as Finn confronts Matthew. Finn tells Matthew he thinks the Matthew is "negative" based on the reputation Jake gave him about Matthew. Matthew tells Finn to ask himself if he feels right about interpreting Matthew as negative and Finn asks his sword and his sword shakes its head, no. Matthew then explains how the bodies of many have come together and, "…distilled themselves to their original source materials and now exist in one-ness". Matthew's purpose is to keep adding to himself until the second age of terror where he'll "restore" the world in his "final form." Finn asks Lemongrab if he's here to merge with Matthew and Lemongrab says, "that is one option…" but then goes on to explain what he is really going to do. Lemongrab pulls out lemon seeds that he calls "Lemon-Jons" and throws them into Matthew's mouth after shouting a metaphor for the "infinite stairs" that is Matthew. Matthew then falls in to the ground and explodes and in his place are appear 15 creatures wearing robes. Horrified, the creatures begin to surround Lemongrab, but Finn saves him.
Jake is shown talking to the Guardian of the Mountain before Lemongrab uses Finn's sword to blow him to pieces. The rocks that were the Guardian turned into the same creatures in robes, groaning in pain. Lemongrab then says, "I'm done, let's go."
The next scene shows Jake carrying Lemongrab, his camel, and Finn to Castle Lemongrab. Lemongrab and his camel jump off of Jake, fall through his castle roof, through a pool of lemon juice, and down his bedroom ceiling where he lands on his bed, looks up at the archaic scene, chews some lemon seeds and spits it into the crack to fill it.
- Lemon People
- Flame Princess
- Cinnamon Bun
- Princess Bubblegum (mirror)
- BMO (mirror)
- Castle Lemongrab is in much better condition than it was under the rule of Lemongrab 1.
- The episode shares its name with a comedy short created by Justin Roiland.
- Finn and Lemongrab's journey through the Mountain of Matthew bares some similarities to thelemic mysticism. While the similarities are there, they are far from striking. However, Adventure Time has made reference to Thelema and Hermeticism before and so this comparison could be meaningful.
- Initially, an adept is led to the abyss by their guardian angel (a butterfly for Finn, Lemon-Sweets for Lemongrab).
- Next, the adept experiences ego-death in order to cross the abyss (both Finn and Lemongrab come to terms with a fact about their body, though Finn seems to have already made peace with missing his right arm. They then abandon themselves and venture into the blackness, likely signifying ego-death).
- Finally, the adept arrives purified in The City of the Pyramids where Crowley describes the enlightened there appear as dust or rocks (similar to Matthew being an amalgamation of small white rocks).
- There is an odd correlation at the 9 minute mark of this episode and the prophecy in the books of Matthew and Revelation in the Bible, that Jesus will return in the Second Coming in full glory "…final form" to "…restore" judge the world.
- The part where Finn and Lemongrab see a miniature version of themselves upon their body parts might be a reference to an early short movie created by Rebecca Sugar called "Singles."
- Finn Cakes from the episode "In Your Footsteps" are baked again in this episode by Jake.
- Finn is bothered by seeing Flame Princess and showing he either still has feelings for her, not over her, angered by the sight of her with Cinnamon Bun (indicating he still believes they're dating), or all three. A problem not seen since "The Red Throne."
- Jake's mug from "Puhoy" can be seen again while he was camping with Finn.
- Finn goes through the mirror with a butterfly that resembles a past life of his revealed in "The Vault." Butterflies were also the astral beast Finn summoned in "Still."
- When running in the mirror, Finn was missing his right arm. Multiple of Finn's alternate selves have been shown to be missing a right arm, and Finn himself even lost his in "Escape from the Citadel."
- The Lemon-Sweets scene from "Another Five More Short Graybles" is seen again in this episode.
- Lemongrab is using the lemon candy that came after Lemonjon exploded in "All Your Fault."
- Lemongrab must come to terms with being considered grease, which the Pup Gang called him in "You Made Me."
- The title card's background music is the same as it was in the episode "Lemonhope Part 1."
- It seems that the new Earl of Lemongrab treats his royal servants better and everything runs much more efficiently in his renovated earldom compared to his earlier episodes.
- Finn's peace with himself and his ability to resist the mountain's choice for becoming one with it is similar to the final decision he makes by the time of "The Comet" of choosing not to abandon his current human form and to continue to live a normal life in Ooo with the possibility of further reincarnation when offered the possibility of full ascendance into another stage beyond this world.
- When Lemongrab is standing on his own nose, it is seen that he only has one shoe on after it was recently pulled off. However, a few seconds later, you can see he has both shoes on.
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