Scooby-Doo! in Where’s My Mummy?

In a flashback to 41 B.C.E., Cleopatra visits the tomb beneath the Sphinx to bury a treasure and form an undead-guarded seal that curses anyone who disturbs it with petrification. The plan is to protect the tomb and its wealth from intruders. This origin story explains the threat that haunts later events.

In the present, Velma Dinkley leads an archaeological team that uncovers Cleopatra's tomb while restoring the landmark. They also find an ancient necklace that hints at deeper history and unlocks the tomb’s significance. The discovery sets Mystery Inc. on a path toward the buried secrets.

Mystery Inc. travels to Egypt for a reunion, but their van breaks down in the desert. Amahl Ali Akbar arrives with his hawk Horus to offer help, and they meet Rock Rivers, the former Fear Facers host whose show was canceled after a scandal of faked footage. The group presses on toward the tomb despite the distractions.

A heavy-handed treasure hunter, Dr. Amelia Von Butch, forces the expedition to detonate the tomb entrance. Velma pleads for caution, warning that disturbing Cleopatra's tomb could unleash the curse. The crew pushes forward under pressure.

A freak sandstorm traps the team inside the newly opened tomb. Omar Prince is seen seemingly petrified within the chamber, heightening the danger. Amelia's crew continues deeper, forcing Fred to try solving parts of the mystery.

The group discovers Omar seemingly petrified within the chamber, heightening the danger. A trap splits Shaggy and Scooby from the others, forcing Velma to continue with Amelia's group. The two teams move forward with conflicting goals as the stakes rise.

As the danger grows, the undead army seems to march, but the team learns it is made of Omar's workers, not a true legion of the dead. Velma appears to be petrified as the danger escalates, and everyone races to recover the ancient necklace from Amelia. The revelation reframes the threat and the mission.

Cleopatra, now a revenant, closes in as Amelia captures Daphne in the main chamber. Fred and Daphne escape outside toward a bustling bazaar, with Amahl helping them regroup. The pursuit continues as the battle tightens around the group.

Amahl spots a path to safety and joins the pursuit, while Fred devises a plan to end the curse once and for all. The team regroups as Cleopatra closes in on the others. Velma's hidden role begins to surface as the strategy unfolds.

Back in the heart of the tomb, Mystery Inc. learns Amelia has captured Velma's truth: the undead army is Omar's workers and the petrified figures are statues. Velma reveals Omar recruited her to help stop Amelia and secure the tomb's protection, while Rivers's footage ensures preservation promises. The revelation reframes the mission as preservation rather than mere treasure-hunting.

Daphne, dressed as Cleopatra, leads the lost city's citizens into battle against the petrified army. The chaos intensifies as treasure and power shift hands. Amahl's support helps turn the tide as the fight unfolds.

Amelia capitalizes by stealing Cleopatra's crown, but a Nile eruption floods the tomb, flushing the riches into the world outside. The flood accelerates the resolution, washing away much of the treasure yet paving the way for preservation and protection. The team pivots from greed to guardianship.

Amelia and her crew are arrested, and Omar’s team continues the Sphinx restoration. Velma's true role in orchestrating the plan is revealed, and Rivers's footage supports a promise of protection for the tomb. The relics are secured, and the tomb gains lasting guardianship.

Shaggy’s misstep with a firecracker detonates a large blast that blows away the Sphinx’s nose, which Omar calls an odd improvement in appearance. Mystery Inc. leaves with the relics secure and the tomb protected, symbolizing a balance between history and guardianship as they head home. The truth about the curse and treasure is finally exposed and understood.