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. 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. Guest stars Frank Welker as Fred and Marla Frumkin as Velma