Plot

Finn decides to build a tower to space.

Finn isn't so happy with his arm replacements, made by the princesses and one time his strong emotions create a telekinetic limb by listening deep in his melon heart. In order to take revenge on his real father he decides to build a tower to the space. Jake is on his side, but P.B. tries to stop him. After Finn passes out at the atmosphere of Earth, P.B. pretends to be his father. When he faces the old guy, he won't punch him anymore. His arm disappear and he get the honor from Jake to ruin the monument.—a viewer

After Finn loses his right arm to his dad in the Citadel, the other princesses try to help by making him replacement arms. But when he gets mad at it while making pasta, Jake tells him to "listen to your melon-heart." When his melon-heart gives him a "magic Finn arm", he decides to build a huge tower into space so he can punch his dad in the face and steal HIS arm. PB gets worried that his magic arm is dangerous, so when Finn loses consciousness on the edge of space, she shows up in a space probe and takes him to a bunker. When Finn wakes up, he sees his dad sitting in a chair and watching tv. Finn punches his dad, but he realizes that this is wrong. It is revealed that PB was wearing a "dad costume". He feels better and thanks PB, then goes home, where Jake suggests that he should topple the tower. Finn does so, but accidentally makes it fall onto the Candy Kingdom. The episode ends with PB yelling, "YAAAAAH! MY ARM!"—Matthew Rude