Three, two, one ... sleepover! Stink and Webster can't wait to launch their very first sleepover. But Stink's sister, Judy, tells them that there are sleepover rules to follow: 1, you have to have a theme; 2, you have to have an activity; 3, you have to have snacks; 4, you cannot sleep. Bravely, Stink and Webster suit up, buckle in, and blast off. Va-ROOM! All systems go for a bedtime voyage to the stars and to Mars!