Time Walker (1982)

"For eons they traveled the galaxies. For centuries one was trapped in a Pharaoh's tomb. Now he is free."

From deep within the tomb of the Egyptian pharaoh Tutankhamun, Professor Douglas McCadden ships the coffin of Ankh-Vanharis to the California Institute of Sciences where X-rays reveal five diamond-like crystals hidden within the coffin. Technician Peter Sharpe steals the crystals but doesn't notice that the powerful X-ray has revived a green fungus. When the coffin is opened at a university press conference, the reporters uncover more than they bargained for. The mummy has disappeared... and the Time Walker is alive again!