A fox-bat named Kozmo joins the Unnaturals as they embark on a dangerous journey to the Greenplains while their human allies try to uncover the truth about why the mutant animals were created--

Hawk accepts her mother Max's help to prevent vengeful hybrids, amoral scientists, traitorous politicians, and a deadly virus from overwhelming her beloved, polluted city.

Carbon dioxide is out of control on Earth, and the fate of humankind rests in the paws of four experimental, untested Animal Astronauts (AlphaWolf, SmartHawk, LaserShark, and StinkBug) who are seeking another habitable planet; first destination is the Plant Planet which at first looks perfect, except that the abundant plant life can think for itself--and it thinks that it really does not like the AstroNuts.

After a short stay with an FBI agent who gives them a chance to attend school and live a normal life, the six genetically-altered, winged youths head toward Florida and Max's ultimate destiny--to save the world, whether she wants to or not.

In a world where people are implanted with technology to recode their DNA, gene-hacking genius Cat must decrypt her late father's message concealing a vaccine to a horrifying plague--

When Max and the Flock discover an unscrupulous scientist who is experimenting on humans in an effort to improve the human race, they decide that they must try to stop him, in spite of Angel's prediction about Fang dying.