Faced with some of their toughest mysteries yet, Fred, Daphne, Velma, Shaggy and Scooby-Doo will join forces with some of the biggest names in celebrity and pop culture including NBA superstar Chris Paul, recording artists Halsey and Sia, Ricky Gervais, Kenan Thompson, Bill Nye, Neil deGrasse Tyson, Mark Hamill, Steve Urkel, Batman, Sherlock Holmes, The Flash, Wonder Woman and many more!