Incendium

"Incendium" is the twenty-sixth and final episode in season three of Adventure Time.

Synopsis
After being rejected by Princess Bubblegum, Jake searches for another girl for Finn, which leads him to the court of the Fire Kingdom to win its princess.

Plot
The episode opens with Princess Bubblegum showing Finn and Jake her new liquid fireworks. Finn makes an attempt to put his head on her lap, but she pushes him away, saying, "Don't be weird, Finn." Finn is heart-broken. In an attempt to cheer him up, Jake seeks a new love interest for Finn. He stumbles across Flambo, who directs him to the Fire Kingdom, where he is introduced to the Flame King and his daughter. Jake announces himself as the "Baron of the Grasslands" and then attempts to win over the Flame Princess for Finn. After two failed attempts, Jake stretches his stomach to look like Finn, who begins to attack him and (seemingly) kill him. This impresses the Flame King who states that a prince who is willing to kill his own buffoon is welcome to date his evil, destructive daughter.

Flame Princess walks over to the Finn-shaped-Jake and embraces him. Some fire people remark that she actually seems normal, and FP responds by shooting fire at them and turning them into Flambo-like creatures. Upon observing this, Jake concludes that FP is an evil wacko. Jake makes his Finn say that he does not like FP anymore. Flame Princess is enraged, causing mass chaos with her destructive fire powers. Jake attempts to flee to the tree house, but she follows him in her flaming, monstrous form and sets the tree house aflame. Jake tries to warn Finn, but Finn does not notice or care because of his depression over PB.

The fire soon spreads inside the tree fort, destroying Finn's picture of PB before his eyes. Finn becomes enraged by this; he looks out the window to see Flame Pricesses' monster form scaling the tree fort. Flame Princess ignites the rest of PB's liquid fire works by accident. This makes Finn even more furious, and he shouts at her to not touch PB's stuff. The drops from the fireworks hit Flame Princess, dousing out her flames. This reduces her to her normal girl form, which surprises Finn. She briefly passes out and Finn catches her in his arms. She wakes up soon after and asks Finn why he doesn't like her. Finn immediately replies that he does like her. Flame Princess blushes and tells Finn to leave her alone. She slaps him and departs in a huff.

The episode ends with Finn telling Jake, "Dude, I think I have a crush."

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Main characters

 * Finn
 * Jake
 * Fire People
 * Flame Princess
 * Flame King
 * Flambo

Minor characters

 * Beemo
 * Princess Bubblegum
 * Fire People
 * Volcano Giant
 * Fire Kingdom Jester
 * Fire Wolves
 * Robot Owl
 * Snail

Songs

 * All Gummed Up Inside
 * Warmed Up

Trivia

 * This episode was previously titled "Heart of the Fire Kingdom".
 * The Snail can be seen at 1:30 in one of the pictures in the tree house room, the picture seems to be of a naked woman but was shreded in the middle so no torso parts are shown
 * Incendium means "fire" or "burning" in Latin.
 * This is the second episode with its name in Latin. The first was "Morituri Te Salutamus."
 * The "wad of hair" from "To Cut a Woman's Hair" and "What Was Missing" returns once again.
 * In the preview, Ricardio's voice (George Takei) seems to be narrating, which is most likely because the episode premieres the day before Valentine's Day.
 * This episode demonstrates that Jake can play acoustic guitar, first shown in the episode "Susan Strong".
 * This is Adam Muto's and Rebecca Sugar's last episode as a team (see promo art). As from this episode, Adam Muto was promoted to creative director and Rebecca Sugar will work together with Cole Sanchez.
 * Even though the episode airs at 7:30 PM, the promo art says it airs at 8:00, a mistake made because of a habit back when episodes aired at 8 PM.
 * Rebecca Sugar said it's the episode when she could finally make Finn cry, although he cried briefly before in "Jake vs. Me-Mow".
 * In this episode Finn tells Beemo to leave him alone and turns around. His shirt leaves his butt crack open and Beemo walks up to it saying "duck duck" and when he says goose it shows Jake and you can hear finn scream.
 * All Gummed Up Inside and Jake's Seranade are almost the exact same, except Jake changed his song slightly so it sounded like he was seranading Flame Princess instead of singing about Bubblegum.
 * Jake sings a song with what looks to be an accoustic guitar (on fire), when in fact, hes playing the ukulele due to its sound.
 * It's possible that Finn may be over PB, given the fact that at the end of this episode he said "Jake, I think I have a crush."
 * Beemo's game was a reference to Nintendo's "ExciteBike"
 * Finn states in the past episode (Dad's Dungeon) that he only cries when someone dies. Finn cried a lot in this episode, but no one died.