Finn doesn't like any of the new arms the princesses give him, so he builds a tower into space to find his dad and get his old arm back. But are his hopes up a little too high?
- Artificial Limbs: Multiple arms from multiple princesses, but none of them work. (The jawbreaker arm he's seen using doesn't have the finesse necessary for daily life; presumably the others couldn't strike a good balance as well.) Finn also somehow manages to form an ethereal one to help him build the tower, but it disappears once everything is said and done.
- Batman Can Breathe in Space: Averted, Finn manages to build the tower into space, but naturally can go no further than the stratosphere as there's no air in space.
- Brick Joke:
- The fawn Finn transported to the then-top of his tower is eventually seen reaching the ground.
- Finn fails to make spaghetti with his new arm, and Jake says he's going to the store to get more. At the end, Jake is sleeping with sauce on his face and the remnants of a plate of spaghetti next to him.
- Determinator: Finn is so determined to get even with his dad, he sprouts a "ghost arm" and builds a massive tower stretching into the heavens. It's ultimately deconstructed, as even though he wants revenge against his father, even Finn has his limits.
- Elemental Embodiment: Carol is a water elemental (a lake) who was so upset at people swimming in her, she evaporated and became a cloud.
- Eye for an Eye: Finn doesn't just want his old arm back, he wants to rip off his dad's arm as a replacement.
- Fauxtastic Voyage: To give Finn some catharsis, PB takes him to the Candy Kingdom bunker after he passes out at the top of the tower, making him think that Martin's picked him up in his spacecraft, and impersonates Martin so Finn can punch her.
- Foreshadowing: The one glimpse Finn has of the portal in space hints that Martin and his alien crew are headed in the direction of Earth.
- Hates Their Parent: Finn hates his dad so much that he wants to rip Martin's arm off and wear it!
- Journey to the Sky: Finn aims to build a tower to reach his dad and get his old arm back. He manages to reach space, but this leads to him suffering air deprivation.
- Madness Mantra: Finn's "Tower of Revenge" song as he builds his tower.Finn: Baby's building a tower into space/ Space is where he's gonna find dad/ 'Cause Daddy's got an arm/ And baby's gonna harm his arm/ By tearing it off of his dad. (Ad infinitum)
- Mind over Matter: Finn manifests psychic powers and uses them to craft a giant tower.
- Nice Job Breaking It, Hero: When Finn demolishes his tower at the end, it falls on top of the Candy Kingdom and smashes a large chunk of it.
- Nigh-Invulnerability: BMO has a block of ice fall on them right from the top of the tower, gets smashed into the ground, and pops up again undamaged.
- Ow, My Body Part!: Princess Bubblegum can be heard yelling "MY ARM!" after Finn's tower falls over onto the Candy Kingdom.
- Power Born of Madness: Finn's spirit arm and telekinetic abilities come from his determination to get revenge on Martin.
- Revenge Before Reason: More or less, Finn wishes to get even with his father and it begins to consume him via his tower building. However, when given the chance for payback, Finn is unable to bring himself to actually rip his father's arm off, before discovering that Princess Bubblegum staged the encounter (pretending to be Martin herself) to give him closure.
- Rocky Roll Call: When Bubblegum and Jake argue over Finn, they end up going "Nyah!" to each other. B-Mo then says "Nyah" just to be part of the argument.
- The Shadow Knows: Finn has an arm shadow, even when his ghost arm is gone...
- Shout-Out: The manner in which Finn telekinetically strips cubes out of the world to build his tower is similar to Minecraft.
- Star Scraper: Making a tower reaching into space is Finn's goal. Almost paralleling the Tower of Babel.
- Also the tarot card, "The Tower" which can mean ruin; but also cognitive dissonance, and breaking a destructive cycle.
- Suddenly Obvious Fakery: When "Martin" turns on the lights, it's revealed he's actually Princess Bubblegum in an unconvincing full-body disguise.
- Vengeance Feels Empty: Before PB reveals herself Finn seems to realize that although vengeance is within his grasp he's not very satisfied with it (the altitude sickness probably wasn't helping his mood either).
