Seventeen

Synopsis
A mysterious knight crashes Finn's birthday bash and presents him with a dangerous gift.

Plot
TBA

Major Characters

 * Finn
 * Green Knight
 * Jake
 * Princess Bubblegum
 * Marceline
 * BMO
 * Starchy
 * Huntress Wizard

Minor Characters

 * Banana Guards
 * Gumbald
 * Chicle
 * Lolly
 * Ice King
 * Lumpy Space Princess (flashback)
 * Snail
 * Flame Princess (flashback)

Episode connections

 * This is the first episode since "Mystery Train" where Finn celebrates his birthday.
 * Gumbald found Fern's remains in "Three Buckets" and in the "The Wild Hunt" a creature resembling him is seen in Gumbald's lab. This episode confirms that this is indeed Fern revealing that he has been revived or survived his supposed death.
 * This episode reveals that during the events of "Skyhooks II", when LSP's anti-elemental lumps freed Ooo from the Elemental Spell and everything was turned into its "true shape", Punchy, Manfried, and Crunchy were reverted back to their previous selves, Gumbald, Lolly, and Chicle.

Storyline analysis

 * As of this episode, Finn turns 17 years old.
 * It is currently unclear if Gumbald, Lolly, and Chicle retain the memories of Punchy, Manfried, and Crunchy.
 * Ice King bursts out of the cake dressed as Flame Princess, which may indicate that he is unaware that she and Finn broke up following the events of "Frost & Fire".

Production notes

 * This episode was released early on the Cartoon Network app on December 7, 2017.