ThefilmfollowsthefunadventuresofthreeancientEgyptianmummieswholiveinanundergroundsecretcity,hiddeninancientEgypt.Thetrioincludesaprincess,aformercharioteer,andhisyoungerbrother,alongwiththeirpetbabycrocodile.Throughaseriesofunfortunateevents,themummiesendupinpresent-dayLondonandembarkonawackyandhilariousjourneyinsearchofanoldringbelongingtotheRoyalFamily,whichwasstolenbytheambitiousarchaeologistLordCarnaby.