To get close to her without turning into a crisp, Finn and Jake enlist to build flame-retardant battle robots. However, the plan backfires when FP realizes that the water and foam Finn uses to protect himself actually cause her physical pain. The episode culminates in a tearful misunderstanding: FP assumes Finn is a "water elemental" because he creates water (tears), and she decides they can never be together because they will only hurt each other. Why This Episode Matters

: Jake insists FP is evil because her father said so, but Finn's desire to see the good in her introduces a recurring theme in Adventure Time : the struggle between nature and nurture. Cool Trivia & "Wait, What?" Moments

Finn is officially over Princess Bubblegum, but his new crush on Flame Princess (FP) is literally burning him. Convinced that she isn't "evil" but just "passionate," Finn and Jake track her down to the Goblin Kingdom, where her chaotic energy is causing accidental destruction.