The alien conqueror Starro has returned to enslave planet Earth.

Zack and his alien buddy Amp must save the planet from an alien invasion.

"Mr. Wuffles ignores all his cat toys but one, which turns out to be a spaceship piloted by small green aliens. When Mr. Wuffles plays rough with the little ship, the aliens must venture into the cat's territory to make emergency repairs"--

For a school assignment, a boy reluctantly writes a letter to Clunk of the planet Quazar, but as more letters and packages are exchanged, it becomes fun.

Cinder and Captain Thorne are fugitives on the run, now with Scarlet and Wolf in tow. Together, they're plotting to overthrow Queen Levana and prevent her army from invading Earth. Their best hope lies with Cress, a girl trapped on a satellite since childhood who's only ever had her netscreens as company.

As big trouble heads toward Los Angeles, California, Max Beederman gathers his superhero friends to face what comes--a trio of extraterrestrial kidnappers who call themselves Monkey Wrench, Elbow, and Shoe.

Injured in a bicycle accident, Zack discovers that his alien houseguest has swiped his brakes, placing Zack's baseball season in jeopardy while subjecting him to an annoying little brother.

At Camp Whatsitooya, twins Joules and Kevin and new friend Nelson face off against large, rabbit-like creatures from the Mallow Galaxy who thrive on sugar, but are not above hypnotizing and eating human campers.

When new meteorite strikes introduce an alien virus, humans develop unique superpowers that trigger a battle between teen hero defenders and supermonsters.

Two children looking up at the night sky wonder what kind of creatures and planets exist in other parts of the universe.