It Came from the Nightosphere

"Nightosphere" is the third episode of Adventure Time's second season. Very little is known about it at this point, aside from a few things confirmed by the production staff.

Characters

 * Finn
 * Jake
 * Marceline (confirmed by Phil Rynda)
 * I Told you when it was going to air!!!! @ThePwner45.

Trivia

 * Originally this episode was called "Return to Nightosphere"
 * This is apparently Pen's favorite episode of the second season.