Josh Guthrie brother of Sam (Cannonball) and Paige (Husk) finds a sentinel that follows his every order. He tries to be a hero using the robot but he just makes things worse. When his brother and sister come home to visit they try to take care of the sentinel once and for all. The sentinel defeats them both and when it was about to kill them, Josh stepped in the way and convinced it to destroy itself to protect him.