The re-imagined story takes place a few days before Halloween when 12-year-old friends Gilbert, Marshall and Amy accidentally revive a mummy they discover in a neighbor’s basement, which they affectionately name Harold. However, they must rush to return him to his resting place before midnight on Halloween. Along the way, the team narrowly escapes a nefarious group of criminals intent on selling the mummy to the highest bidder. When Harold is inevitably captured, Marshall, Gilbert and Amy must band together to stand up to the criminals, face their fears and rescue their new—but rather “ancient”—friend.”
- Malachi Barton as Marshall
- Christian J. Simon as Gilbert Anderson
- Sophia Hammons as Amy
- Phil Wright as Harold
- Melanie Brook as Buzzy
- Brent Stait as Kubot
- Jordana Largy as Diane, Marshall's mother
- Jaime M. Callica as Ted, Diane's boyfriend
- Karin Konoval as Ravensworth
- This is the first Disney Channel Original Movie to be a remake of another DCOM.
- Production started in November 2020.
- It got added to Disney+ on October 8, 2021, just a week after the premiere on Disney Channel.
- Under Wraps is the lowest rated Disney Channel Original Movie in history, only receiving 0.41 viewers on premiere night.
- China Anne McClain's hit song "Calling All the Monsters" from the A.N.T. Farm episode "mutANT farm" was playing during the Halloween party.
- There was a dog dressed up as Shrimpy from Zombies.
- At the Halloween carnival, there were two kids dressed up as Zed and Addison from Zombies.