Teenage Mutant Ninja Turtles Universe, Volume 4: Home

"Discover the secret origins of the Triceratons: how they began on Earth, what that means for their return, and how they successfully rebelled against their Utrom captors! Plus, the Turtles fight to save their city, but become trapped in tight quarters when NYC is evacuated. Will they find a way to freedom without driving each other crazy? Then, Raphael and Alopex go undercover at Null Industries where they find more than they bargained for, including very angry mutants!" --Amazon.com.