With "BMO" having kicked things off, viewers were treated to a sneak preview of the next special "Obsidian," which spotlights Marceline and Princess Bubblegum as they journey to the imposing, ...

Ax bass-wielding rock star with an affinity for pranks, Marceline the Vampire Queen has long been one of “Adventure Time’s” most intriguing characters. Tonight, the beloved animated series will ...