It's all systems go for a bedtime voyage to the stars and to Mars! Stink and his best friend, Webster, let their imaginations fly at their first-ever sleepover. Three, two, one . . . sleepover! Stink can't wait for Webster to arrive and sleep over for the very first time. Big sister Judy is ready with all the important rules: (1) You have to have a theme. (2) You have to have an activity. (3) You have to have snacks. (4) You cannot sleep! When Webster shows up in his outer-space pj's, it doesn't take long for a theme to emerge. Stink's race-car bed doubles as a spaceship and an old keyboard is a control panel as the explorers suit up, buckle in, and blast off . . . Va-room! Playful illustrations and astronaut lingo capture their imaginary adventure from takeoff to spacewalking, while more creativity comes into play when they land and experiment with space-worthy snacks.