Full AspenCat Catalog

Cassie, one of a group of kids who have been given the power to transform into animals in order to fight an invasion of the alien Yeerks, leads her friends into yet another mission when she discovers the Yeerks are trying to access Zone 91, the most secret place on Earth.

The Animorphs wonder if they can trust one of their members not to expose them all to the Yeerks.

The Animorphs and Ax have allies willing to fight against the Yeerk invasion now that Andalites have finally arrived on earth. But there are only four of them and they don't want to fight alongside humans. Ax must choose a side. His friends? His people?

The Yeerk that controls Jake's brother Tom is desperate to keep Tom from going with the family to his great-grandfather's funeral, even if he has to kill Jake's father.

Young Will Parker and his companions make a perilous journey toward an outpost of freedom where they hope to escape from the ruling Tripods, who capture mature human beings and make them docile, obedient servants. Long ago, the Tripods -- huge, three-legged machines -- descended upon Earth and took control. Now people unquestioningly accept the Tripods' power. They have no control over their thoughts or their lives. But for a brief time in each person's...

The Animorphs try to thwart the Yeerk plan to invade Earth by destroying the ability of people to make decisions.

Thirteen-year-old Felix Yz chronicles the final month before an experimental procedure meant to separate him from the fourth-dimensional creature, Zyx, with whom he was accidentally fused as a young child.

In his new book, Howie the wire-haired dachshund writes all about how the Mind Swappers from Asteroid 6 invade Earth and how he and his friend Delilah save the day.

Cassie believes her strange dreams are just a side effect of having been given the alien power to morph into an animal, but when she learns that Tobias has been having the same dreams about the ocean, they realize someone is issuing a call for help.

George is heartbroken when his neighbor Annie and her space-scientist father move to Florida, but when Annie sends him a secret message telling him she has been contacted by aliens with a terrible warning, he joins her in a galaxy-wide search for answers. Includes scientific essays on space travel.