Scooby-Doo and Shaggy must go into the underworld ruled by the Goblin King in order to stop a mortal named The Amazing Krudsky who wants power and is a threat to their pals, Fred, Velma and Daphne.
The story sees after a young man transferred from juvenile to adult prison, where he is taken under the wing of both Australia’s most despised criminal, and a soon-to-be-a-paroled inmate. A paternal triangle grows between them, suggesting that even the worst of men may have a little bit of good inside them — that will be their eventual undoing.