Waffles, Pancake, and Mom-Cat go to visit Gramps and Grammers, but this is the kittens' first time flying on an airplane, and Waffles is a little nervous.
When Cat-Stro-Bot gets into trouble while helping the CatStronauts team with their research on Europa, the CatStronauts defy mission control and undertake a secret mission to save their friend on Jupiter's frozen moon.