The cave

After a tragic event that happened to both the young human girl, and the king of the Nightosphere, it has left the two teens with emotional scars although Marshall had Fionna forget the part where he almost killed her. So now, she is left thinking he had abandoned her and their friendship out of the blue. But when strange visits of unnatural monsters from the Nightosphere keep popping up unexpectedly all over Aaa, and targeting Fionna specifically, The Vampire king has no choice but to put his guilt aside to protect the cherished human of his.