A prologue set before ''The 13 Ghosts of Scooby-Doo'' depicts a young List of Scooby-Doo characters#Vincent Van Ghoul and his partner Mortifer hunting down and successfully sealing the final ghost into the Chest of Demons. Mortifer however is attacked and seemingly killed by minion ghosts as a tearful Vincent makes his escape. Scooby-Doo (character) would eventually accidentally reopen the chest but would catch all but one with the help of his friends Daphne Blake and Shaggy Rogers. The final ghost, still at large, seeks to release its counterparts and take control of the planet.