Clover Martinez and the Last Teenagers on Earth are exploring the galaxy after leaving Earth behind, even if they are homesick. When their ship receives a distress signal from their former home, they arrive to find strange crystal formations are taking over Earth's soil and threatening to destroy the planet. They discover a colony of survivors in the mountains, but relief gives way to panic as the teenagers realize these survivors aren't who they...

Jake Foster, a shapeshifting alien of goo disguised as a human, and his spunky friend Agnes investigate the mysterious takeover of their neighbors by "imblobsters" and uncover the reason Jake is losing control of his ability to keep his human shape.

After a year on Mars, a young boy and his family migrate to the planet Choom, but the inhabitants of Choom, the Zhuri, who look like giant mosquitoes, don't really like humans and it's up to the boy and his family to change their minds if they hope to survive.

Sprouting a tail and spikes over the summer before fifth grade, Sawyer, a boy with the dinosaur gene, is bullied in school, but when his tormentors begin to disappear, it is up to Sawyer, his best friend Elliot, and a mysterious new girl to rescue them from a galactically horrible fate.

"Cassie Sullivan, the survivor of an alien invasion, must rescue her young brother from the enemy with help from a boy who may be one of them"--

"When Earth is threatened by an invading race of bugs called the Hunger, 11-year-old Finn, his arch-nemesis, Lincoln, his crush, Julep, and one pink unicorn lunchbox become Earth's last best hope against destruction"--

When the vuvv bring alien technology to Earth, lost jobs lead to poverty and the pay-per-minute dating videos Adam and his girlfriend, Chloe, provide in order to survive soon erode their relationship.

The Human Garde Academy was created in the aftermath of an alien invasion of Earth. It was meant to provide a safe haven for teens across the globe who were suddenly developing incredible powers known as Legacies. Taylor Cook was one of the newest students and had no idea if she'd ever fit in. But when she was mysteriously abducted, her friends broke every rule in the book to save her. In the process, they uncovered a secret organization that was...

"It has been one year since the breathtaking events of United as One -- and our world will never be the same. The invasion of Earth was thwarted by our alien allies known as the Garde. But in order to do so, they unleashed their Loric energy and it spread throughout the globe. Now human teenagers have begun to develop incredible abilities -- Legacies of their own. As the world tries to figure out how best to deal with the emergence of these powerful...

“If it wasn’t for the fused-with-Zyx thing, I suppose I would just be normal—whatever that means.”
 
When Felix Yz was three years old, a hyperintelligent fourth-dimensional being became fused inside him after one of his father’s science experiments went terribly wrong. The creature is friendly, but Felix—now thirteen—won’t be able to grow to adulthood while they’re still melded...