Captain Benny Bumble's spaceship, the "Star-Smuggler," runs on giggles, which are currently in short supply. To generate more laughter, Benny and his co-pilot, Fiona Featherbottom, retrieve a giant, wobbly purple jelly from a picnic. Benny's silly antics with the jelly make Fiona giggle uncontrollably, powering the spaceship towards the moon.