extraterrestrial beings

Alien siblings, Klatu, Lek, and Ploo go to Area 51 to find their spaceship and meet the Great Ones, four Looglings who crashed on Earth fifty years prior.

Siblings Klatu, Lek, and Ploo from the planet Loogl return to Las Vegas where they discover an impending invasion of earth by evil aliens disguised as Elvis impersonators.

There are some pretty weird grown-ups living in Bailey City. The kids think the new school nurse is a Martian.

Rod is surprised when a miniature spaceship lands in his school science project and reveals five tiny aliens, who ask his help in apprehending an interstellar criminal.

The kids at Bailey School investigate the rumor that the coordinator of the annual Halloween party is an alien intent on stealing their town's candy.

After Susan sees Mr. Smith the substitute teacher peel off his face, she knows he's an alien and only Peter believes her; together they work to save the class from Mr. Smith's horrible plans.

Seventh-grader Duncan must find out which of the four new teachers in his school is an alien before his brains get fried to a pulp.

Rod and his bratty cousin Elspeth are snatched into another dimension by the monstrous alien Smorkus Flinders.

Peter, a typical seventh-grader, finds himself touring the planet with his friends Susan and Duncan, and with three aliens in disguise. Their mission is to file a report that will report the Earth's future in the universe.

The Bailey School kids are going to find out if the art teacher with braces on her teeth is really an alien from outer space.