"SCOOB!" reveals how lifelong friends Scooby and Shaggy first met and how they joined with young detectives Fred, Velma and Daphne to form the famous Mystery Inc. Now, with hundreds of cases solved and adventures shared, Scooby and the gang face their biggest, most challenging mystery ever: a plot to unleash the ghost dog Cerberus upon the world. As they race to stop this global "dogpocalypse," the gang discovers that Scooby has a secret legacy and an epic destiny greater than anyone imagined.
But when Cecilia's abusive ex (Oliver Jackson-Cohen, Netflix's The Haunting of Hill House) commits suicide and leaves her a generous portion of his vast fortune, Cecilia suspects his death was a hoax. As a series of eerie coincidences turns lethal, threatening the lives of those she loves, Cecilia's sanity begins to unravel as she desperately tries to prove that she is being hunted by someone nobody can see.
In the shadow of a dark internet conspiracy theory, a group of elites gathers for the very first time at a remote Manor House to hunt ordinary Americans for sport. But the elites' master plan is about to be derailed because one of The Hunted, Crystal (Betty Gilpin, GLOW), knows The Hunters' game better than they do. She turns the tables on the killers, picking them off, one by one, as she makes her way toward the mysterious woman (two-time Oscar winner Hilary Swank) at the center of it all.