The 13 Ghosts of Scooby-Doo: Season 1, Episode 9 - ProjectFreeTV

1 - 9: It's a Wonderful Scoob

When the Time Slime tries to zap the gang, they take his Time Scepter and use it to show Scooby (who believes he is more of a hindrance than a help to the gang) what their lives would be like without him.