Prince Erik Greystone is forced to postpone his marriage to the Princess of Camarand and defend her kingdom from attack by Prince Blackpool, who's wearing a monocle that empowers him to use black magic.

On a courtship picnic, Prince Erik and Princess Ariel blunder upon a haunted castle that bears a curse marking transgressors for death at the hand of friends -- in this case, a crazed Marko.

Prince Erik mounts a suicide mission up the dreaded Cliffs of Death, where Blackpool's wicked wizard has sited a medieval version of the neutron bomb.