Steddfod! Steddfod!

Three friends try to save their mummified friend, Harold, from greedy criminals by returning him to his resting place before midnight on Halloween.

The maniacal baby of the Griffin family, Stewie, meets his future self. In doing this he discovers that his future image is not what he has anticipated because of a near death experience.

As Marshall, Gilbert and Amy are preparing for her father’s Spooktacular Halloween-themed wedding to his fiancé Carl, plans go awry when they discover that their mummy friend Harold and his beloved Rose may be in danger.

When the Boogey Man causes Grim to lose his powers, rank, and title in the Underworld Court for misusing his powers, he plots to seek out Horror's Hand and take over the world. It's up to Billy, Mandy, Irwin, and Grim to get to Horror's Hand before the Boogey Man does.