The following information is from the Adventure Timecomic book series. It may not be part of the same canon or continuity as the animated series.
Adventure Time: Marceline Gone Adrift Issue 5 is the fifth issue of the 2015 mini-series.
As Marceline and Princess Bubblegum try to get back to Ooo, Finn has to figure out how to deal with Suspencer when he can’t get close to him! Meanwhile, Cinnamon Bun is taking advantage of his new abilities to the extreme.