Marceline and Princess Bubblegum, BFF's no more...Marceline is struck down by a mystery virus and sets off on a rampage through the kingdom of Ooo. In order to save both Ooo and Marceline herself, Princess Bubblegum accidentally propels Marceline into the farthest reaches of space...and strips her of her powers! Guilt-ridden, Princess Bubblegum sets off on a space rescue that'll test the power of her mind...as well as the power of friendship, while Marceline helps a space tribe of hounds from disaster.