When the Justice League goes missing and villains overrun Metropolis, there’s only one team that can solve this mystery: Scooby-Doo and the gang! But wait, there’s a new dog in…

An underdog teen joins a group of young Cadets who\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\’ve been chosen to bond with Robo Mechs from space and defend Earth against alien invaders.