What if your imagination could take you anywhere? Literally. Twelve-year-old Simon loves to daydream—a little too much, according to his twin sister Casey, who prefers real-life adventures. She leads the two into their father’s workroom, which is strictly off limits, and they are zapped by their father’s mysterious invention. Afterward, exhausted and dazed, Simon imagines that he is flying a spaceship. Suddenly, he finds that he can no longer control the fantasy, and he and his sister end up stuck in space. For real. Simon and Casey are taken prisoner by the evil Gamnilians, an alien race bent on galactic domination. In jail they come across an unexpected ally in Geet, a fearful but clever little alien who wants exactly what they want: freedom, and to find a way home. The trio teams up to attempt a daring escape, leading to action-packed adventure filled with danger, friendship and lots of laughs.