When their spaceship crash lands on Earth, Ploo is captured by the Army and taken to the mysterious Area 51. While her brothers, Lek and Klatu, try to rescue her, Ploo uses her ESP to make a new friend.

After crashing their spaceship in the Nevada desert, Klatu, Lek, and their sister Ploo go to Las Vegas in search of the one mechanic who can fix it.

While visiting Dizzyland near Los Angeles, Klatu, Lek, and Ploo, the three alien siblings from the planet Loogl, find a fuzzy little alien named Mu in the sideshow zoo of the amusement park and decide to set it free.

Siblings Klatu, Lek, and Ploo, along with their human friends Lily and Jo-Jo, travel to Hollywood, California, where the aliens become extras on a science fiction television show while waiting for the spaceship that will take them home.