Marceline starts feeling restless and comes across a motorcycle gang of storm clouds. Taking this as a chance to try something new, Marceline sets off on the open road with her new friends but things take a turn when she realizes that the storm clouds might be taking things a bit too far when it comes to their pranks. Marceline has to make a choice, to join in and create a natural disaster bigger than Ooo has ever seen or to go back to her boring quiet life--luckily, the answer comes from an unexpected source who just happened to be trailing the clouds... for research, of course.