Hero Heart

Synopsis
A full-scale war breaks out between two kingdoms, and Ooo's most unlikely hero must put an end to the fighting.

Plot
War breaks out between the Fire Kingdom and the Candy Kingdom. Lumpy Space Princess is still tying to stop Finn (Fire Form) from attacking the Candy Kingdom.

Major Characters

 * Finn
 * Lumpy Space Princess
 * Ice King
 * Betty
 * Princess Bubblegum
 * Flame Princess
 * Marceline as Marshmaline

Minor Characters

 * Fire/Candy Gunter
 * Fern as Fun the Human
 * Neptr as Nectr
 * Lemongrab as Lemonpink
 * Pink Lemon Camel
 * Gummy BMO
 * Lady Rainicorn/Flameicorn
 * Fire/Candy Wyatt
 * Candy Teenage Bear
 * Candy Mrs. Cow
 * Candy Stag
 * Candy Bronwyn
 * Candy Me-Mow
 * Flame People
 * Candier Candy People
 * Candier Mr. Cupcake
 * Candier Colenel Candy Corn
 * Candier Crunchy
 * Candier Banana Guard
 * The Lich (in Finn "happy place")
 * Snail

Mentioned

 * Jake

Music

 * Let Me Call You Sweetheart

Trivia

 * All of the main characters appear in this episode except Jake. The aforementioned character has not appeared since the episode "Slime Central" despite being mentioned by LSP.
 * This is the fourth time Jake has not been in consecutive episodes. The first being "Rattleballs" and "The Red Throne," the second being "Lemonhope Part 1" and "Lemonhope Part 2," and the third being "Be Sweet," "Orgalorg," and "On the Lam." He was mentioned in the first two episodes.

Cultural References

 * The song that all of the characters excluding Finn sung is Let Me Call You Sweetheart by Peerless Quartet and Henry Burr which was recorded in 1911.

Episode Connections

 * During Finn's visit to his happy place, flashbacks to "To Cut a Woman's Hair", "Mortal Recoil", "Too Young", and "The Pajama War" are shown. For the "Too Young" flashback, Princess Bubblegum appears in her 13-year old form, with archived audio of Isabella Acres used albeit being credited.

Production Notes

 * This episode was made available for download on iTunes on April 17th.

Errors

 * While Fun the Human and Lemonpink are conversing at a table in the Tree Fort, a black outline appears around Fun's diamond face for a frame.