Watch full Scooby-Doo! and WWE: Curse of the Speed Demon online full HD. Cartoon movies Scooby-Doo! and WWE: Curse of the Speed Demon online for free in HD. After helping WWE solve the mystery of the ghost bear in Scooby-Doo! WrestleMania Mystery, the Mystery Inc. gang is seen at WWE’s latest venture, The Muscle Moto X Off Road Challenge, an off-road racecar race for WWE superstars, with a big cash prize. Scooby-Doo and Shaggy are there working at a food truck. Many WWE superstars are in the race, including WWE chairman Mr. McMahon's own daughter Stephanie McMahon and her husband Triple H. Scooby and Shaggy are excited to hear that The Undertaker is going to be in the race. Suddenly a demon racer named Inferno appears in a big race to sabotage the race, Mr. McMahon hires Mystery Inc. to solve the mystery. Mr. McMahon wants Stephanie to pull out of the race, but she refuses. After learning they both have wealthy dads, Daphne becomes friends with Stephanie, making Velma feel very left out. The Undertaker is disappointed that his partner, Dusty Rhodes was injured in the race and recruits Shaggy and Scooby to be his new partners under their names "Skinny Man" and "Dead Meat", to which they reluctantly agree to. However, since Undertaker's car was also destroyed in Inferno's attack, Fred modifies Shaggy and Scooby's food truck so they and Undertaker can race that car instead and nicknames it "The Scoobinator"...