Professor Douglas McCadden transports the Ankh-Vanharis coffin to the California Institute of Sciences, where X-rays uncover five diamond-like crystals concealed within the coffin. A powerful X-ray has awakened a green fungus, which technician Peter Sharpe steals. An unanticipated discovery is made when a university's press casket is opened. The mummy has vanished... and the Time Walker is back!