"High school senior Cara Sweeney gets more than she bargained for when she agrees to participate in earth's first intergalactic high school exchange program"--

Cara and Aelyx maintain their extremely long-distance relationship, with Cara continuing as an exchange student and becoming human representative to a panel preparing for a human colony on L'eihr and Aelyx working on a campaign to improve human-L'eihr relations, which soon makes him a target of extremists.

After heroically saving his classmates, fifth-grader Sawyer's life as a dinosaur-human hybrid has gotten a lot easier until Sawyer, Sylvie, who is part Martian, and Elliot head to Mars in search of Sylvie's missing dad and discover that Mars is trying to kick Pluto out of the solar system.

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 up to the boy and his family to change their minds if they hope to survive.

After the aliens begin their invasion of Earth, a rebel faction contacts Anaya and proposes a plan that would allow humans, hybrids, and cryptogens to coexist peacefully, though it is unclear if all hybrids will agree.

When the peaceful alien-run government decides to simply withdraw from Earth, it seems that the terrorist group Sapience is going to get the "free" Earth it wanted; but Donovan Reyes, member of the security forces, and once a prisoner of Sapience, realizes that freedom comes with a price--other alien races want to strip the planet of its resources, and if anyone is going to survive, what is left of the security forces and Sapience have to work together....

"After being on the run, Ariane Tucker finds herself back where she started--under the cruel control of Dr. Jacobs, head of the research facility that created her. Now she must participate in the upcoming trials; a deadly competition pitting her against other alien hybrids, each representing a rival corporation"--

"Eight-year-old Finn is the first kid born in space and he spends his days looking for a new planet to call home with his three best friends and his robot, Foggy. He's used to wild, galaxy hopping adventures. But when Explorer Troop 301 gets stuck on a planet that's about to explode, Finn and his friends will have to face giant aliens, a leader with mind control powers, and one evil, fluffy bunny rabbit in order to save the planet . . . and themselves"...

As her dad and best friend lie dying in the hospital, Miki and Jackson prepare for the final mission that, hopefully, will win the Game before the walls between the real world and the deadly Game come crashing down.

As Naomi and her fellow teen astronauts investigate the fate of their predecessors on the Europa colony, back on a deteriorating Earth, Leo works with a renegade scientist to warn the crew about hostile extraterrestrials. Leaving Earth behind is hard, but what's ahead, on Europa, could be worse. The International Space Training Camp continues to hide the truth about what happened to the last group of astronauts who attempted a similar colonization...