Check out the official "Scoob" teaser trailer starring Mark Wahlberg, Zac Efron, Amanda Seyfried, Frank Welker and Iain Armitagebr br Scooby and the gang face their most challenging mystery ever: a plot to unleash the ghost dog Cerberus upon the world. As they race to stop this dogpocalypse, the gang discovers that Scooby has an epic destiny greater than anyone imagined.