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"Dungeon Train" is the thirty-sixth episode in the fifth season of Adventure Time. It is the one hundred and fortieth episode overall.
Finn and Jake discover a train where every car is a dungeon filled with a new foe for Finn to fight. Jake quickly gets bored and wants to leave, but Finn is having the best time and doesn't want to leave... ever!
The episode begins with Finn and Jake traveling to a mystery cave that they heard about from Flambo's brother. Finn starts asking weird questions on the way, which causes Jake to worry about him and ask whether it has anything to do with his breakup with Flame Princess. Finn tries to reassure Jake, telling him he is fine, and that he is just feeling "gray."
The two encounter the Dungeon Train while talking, and they decide to wait until the train passes before continuing on their way. Two hours later, however, the train is still passing, so Jake stretches upwards to find out that the train is circling in a loop without any sign of stopping. They both go into the train to try and pass through, but they encounter a strange-looking warrior who attacks them without warning. Finn pushes him out of the car, and they retrieve the loot that the warrior dropped, including a magical sword and his iron helm. They decide to see what else is on the train and move from cart to cart, fighting various kinds of monsters like Crystal Ants, Geode warriors, mud monsters, and slime creatures, picking up all the loot that the monsters drop along the way.
Much later, Finn and Jake have gathered a fair amount of loot, and Jake says that they should come back someday. Finn questions why they should leave (saying they have only been there for about 3 hours), but Jake replies that he is starting to get bored since the carts and monsters are all the same. Finn asks Jake to go for one more cart, and Jake reluctantly agrees. Initially, the cart appears empty. However a big flesh-type creature appears, which Finn dubs a boss battle before rushing in to fight. The two of them defeat the creature, but Finn shows no signs of wanting to leave the train, continuously going from cart to cart. Jake tries to persuade Finn to leave by reminding him about the mystery dungeon, food, and the repetitive monsters; however, Finn does not seem to care, since the train contains greasy meat as part of the "loot," and Finn does not mind if the monsters are repetitive, nor does he care if they were in a weird dungeon or a weird train since it is all weird.
Arriving in the Ant Cart again, Jake tells Finn that "this place is bad news for you" and that they should take off; however, Finn claims that "all this feels good... like when you made those biscuits way back." Jake reminds Finn that it was just the butter he was responding to and that the train is just like that. After defeating another boss, Jake discovers a future crystal that shows Finn as an old man who continues to fight on the train after an unknown number of years. He shows it to Finn, but Finn is merely impressed by his future self, saying that he will have the best life. While Finn is fighting the Hair Apes, Jake tells him that he will leave, but secretly hides right outside the cart and sits next to a Hair Ape, who seems to be tired of fighting. Jake takes a nap, but wakes up to find the Hair Ape trying to shock him.
He returns to the cart to find Finn "all souped up now" with a spider wand, an orange flamberge, a large flame coat, and an iron mask. Shocked that he became one of the "twisted-lost-soul boss guys," Jake decides to force him out of the train. Finn uses his spider wand to defeat Jake and steals his backpack. While looking inside, he finds the future crystal and uses it to see the future. This time, however, it shows an old Jake loyally following Finn around even after all those years. Deciding to set things right, Finn returns to Jake. Jake apologizes and says that he will stay on the train with him, but Finn apologizes as well, saying that "its all over now." Jake believes that they are getting off the train, but Finn tells him that he will go back in about a week or two. Jake gets worried that Finn is still obsessed with the train, but Finn reassures him that he has learned his lesson and gives him the future crystal, which now shows the two back at the Tree Fort washing dishes together.
- Flame Princess
- Flambo's Brother
- Jake and Lady's offspring
- Finn is about five feet tall, according to Jake.
- Earth appears in the title card with a chunk missing, in accordance with the Mushroom War.
- It is likely that the "boss fights" on the train are other adventurers that were caught in the infinite cycle of gathering loot on the train. This is evidenced by the fact that, like Finn, they enter the rooms through doors rather than being spawned already. This theory is further supported by Jake's exclamation that Finn is "one of those twisted, lost-soul boss guys".
- The future image of Finn appears to be missing his right arm, having replaced it with a hook and whip.
- On the outside of each car of the train is an ouroboros in the shape of an infinity symbol (∞), which doubly symbolizes the train's cyclical nature.
- The Dungeon Train is similar in concept to the Battle Subway from Pokémon Black, Pokémon White, Pokémon Black 2, and Pokémon White 2.
- The Dungeon Train appears to share many characteristics of a dungeon crawling video game.
- Monsters drop equipment, items, and/or money after they are defeated.
- As one progresses through the game, the monsters will get stronger and stronger on each new floor.
- No matter how many times one enters the same floor, the monsters will respawn.
- In the promo art, the crystal ant seems to be wearing Crocs.
- On Finn's shield is a Rubin vase, a famous illusion.
- The helmet Jake wears throughout the episode appears to be a cross between the Brodie helmet, worn by Commonwealth countries and the United States during World War One, and the Pickelhaube, the helmet worn by German soldiers at the beginning of the same war.
- Finn is seen yet again (this time in the direct future of his universe) with a robotic arm in place of his right arm, which has been implied and seen in multiple episodes such as "Mortal Folly," "Puhoy," "Finn the Human," "The Vault," and many more. The title art also shows Finn's shadowy reflection without a right arm.
- The title music was the same as the episode "Dungeon" from Season 1.
- When Jake puts his forehead on the future crystal, he seems to look like his old self in "One Last Job."
- When Finn enters the room with the Hair Apes, the one with the winged hat is above the door, and each ape has a different hat. Later, however, the ape is on the other side of the room.
- When Finn looks in the future crystal, his pink shoulder armor becomes green like his pack.
- There are some scenes where Finn's gauntlet is missing in the room where Finn battles with the big flesh-type creature.
- When Finn's battle moon starts orbiting his head the first time, one of the spikes on his crown vanishes.
- At the end of the episode, the infinity symbol on the train door is changed to a circle.
- The first boss drops a left-handed gauntlet, but when Jake picks it up, he puts it on his right hand. (See Right Handed and Left Handed)
- Finn's willpower seems to be strong enough, fueled by his love for his brother, to be able refuse the temptation of convenience, ignorance, and self-indulgence. With this and all its factors in mind, one can see that Finn's maturation has reached a point where he may determine the righteous path in such situations.