When Ben discovers that an alien is living in his house, he is less than thrilled. After all, the alien looks strange, eats only green food, and doesn't let Ben watch television when he wants to. The "Alien" is Ben's grandfather.

The Alien isn't any happier. Convinced he is living with a monster, he complains about how Ben runs all over the house, yak-yaks like a parrot and eats only junk food. The "Monster" is his grandson, Ben.

This imaginative full-color picture book will delight readers aged eight and under as it explores the problems that different generations have in understanding each other. As Ben and the Alien learn more about each other, they discover that they have more in common than they ever would have thought.