When Harry discovers that his old nemesis, Galactic Gary, has escaped from prison, stolen a spacebin and is hiding on three different planets at once, it's up to Harry and Colin to save the day yet again. Harry and Colin are up to their old tricks, pursuing Galactic Gary through space and time, while attempting to clear up the trail of destruction that he leaves in his wake.

This title is the fourth installment in the Cosmic Colin series.