Splinter’s death looms large over the Teenage Mutant Ninja Turtles and their allies as they all try to find new purpose in their lives. Donatello is working with the Utroms and runs afoul of a new alien that leads to combat. Raphael is struggling and about to endure the next great change of his life. Casey tries to help April explain the truth behind her identity, who she is, and who her family is. And Michelangelo, acting as an ambassador to Earth for aliens, must help a group of Protoceratons.