When Ruff digs up a sarcophagus in his backyard, he's convinced it's an authentic Egyptian mummy, and he's also convinced it comes with a curse. He sends the FETCHers to the Museum of Fine Arts to authenticate the artifact, and also to a carbon dating lab to verify the age of the mummy. The kids then go through Tomb, an Egypt-themed amusement park to solve the mystery of the mummy.