When Space mouse Geronimo Stiltonix helps an alien spacecraft get back to its home planet, their queen becomes enchanted by Geronimo, and tries to force him to marry her and stay on the planet Flurkon forever.

"Había una vez...[There lived] a girl named Petra Peña, who wanted nothing more than to be a storyteller, like her abuelita. But Petra's world is ending. Earth has been destroyed by a comet, and only a few hundred scientists and their children--among them Petra and her family--have been chosen to journey to a new planet. They are the ones who must carry on the human race. Hundreds of years later, Petra wakes to this new planet--and the discovery...