The gang is invited to a television studio in Los Angeles for Scooby's birthday, which is to be celebrated with a This is Your Life-style special hosted by Mark Winkendale and directed by Milo Spender. To Scooby’s happiness, he also reunites with Velma and Fred on the show, both of whom have gotten their own careers. However, a vengeful villain from Scooby’s past tries to ruin the night for him and the gang.