Professor Douglas McCadden transports the coffin of Ankh-Vanharis from the Egyptian pharaoh Tutankhamun's tomb to the California Institute of Sciences, where X-rays show five diamond-like crystals concealed within. Peter Sharpe snatches the crystals, unaware that the intense X-ray has resurrected a green fungus. When a university press conference's coffin is opened, the reporters discover much more than they bargained for. The mummy has vanished.... and the Time Walker has been brought back to life!