"Finn Caspian, his three best friends, and his robot Foggy are excited to explore a brand-new planet...until Finn's mom makes them bring along an annoying new robot named Voltronix Zu. Putting up with Voltronix's bragging is bad enough, but when he accidentally turns the planet inside out, the Explorers get attacked by angry rock giants! Can the four friends find a way to save the planet--and the bubble aliens who live there--before Voltronix causes...

The Animorphs are helped by the Taxxons in their war against the Yeerks.

"Four young Starbounder students must once again risk their lives, travel throughout space,and dismantle an evil conspiracy to save their world"--

Twelve-year-old Alice Dare is one of 300 seven- to sixteen-year-olds evacuated to Mars to attend school and train as soldiers, safe from the war with Earth's invading aliens, the Morrors, but when all of the adults and robots mysteriously disappear, the youths must survive on their own.

"It is Earth year 2256--but the fate of the few who even remember Earth is perilously in doubt. Mina Saunders-Chang and many of the surviving humans are stranded in the Centauri system, having barely survived their confrontation with the Telphon refugees. Now everyone--human and Telphon alike--is caught in the blast zone of the Centauri supernova. And yet there's only one question Mina is asking: Where are Liam and Phoebe? Having barely made it through...

The Yeerks, a parasitic alien race bent on enslaving the Earth, have discovered a way to cause a person to demorph. With this device, they plan on capturing the Andalite bandits. The Animorphs have to get rid of the device, or be captured by the Yeerks.

The fact that his mother has been infested by an alien parasite and his father is planning to remarry puts Marco under such stress that he begins to morph into bizarre creaturees that he is afraid will attract the attention of the Yeerks.

Rachel, one of the Earth teenagers dedicated to stopping the parasitic alien race known as the Yeerks, is horrified when she finds herself split into two nearly identical girls.

"Zaira Citlali is supposed to die. After all, she's the god Indigo reborn. Indigo, whose song created the universe and unified people across galaxies to banish Ozvios, the god of destruction. Although Zaira has never been able to harness Indigo's powers, the Ilori Emperor wants to sacrifice her in Ozvios's honor. Unless she escapes and finds Wesley, the boy prophesized to help her defeat Ozvios and the Ilori, once and for all. Wesley Daniels didn't...

When his pet gerbil Henrietta is beamed aboard an alien spaceship, Nicholas finds himself being chased all over the universe by aliens and must find a way to get back home.