12-year-old friends, Marshall, Gilbert and Amy accidentally revive a mummy they discover in a neighbor's basement. They affectionately name the mummy Harold, and must rush to return him to his resting place before midnight on Halloween.

Friends Marshall, Gilbert, and Amy accidentally revive and release a mummy from its sarcophagus in the days leading up to Halloween. At first terrified, they quickly learn that the Mummy who they affectionately name 'Harold' is actually very sweet and in dire need of assistance.