A wealthy architect (Roy Thinnes) and his wife (Jane Merrow) have acquired an Ancient English Abbey and are transporting it back to the U.S., secured in the plane's cargo hold, unbeknown the evil it contains. Aboard the flight are a select group including a pushy millionaire (Buddy Ebsen), a cynical drunken ex-priest (William Shatner) and a crazy objector to the Abbey's removal (Tammy Grimes). Chuck Connors plays the lantern-jawed pilot. When the invisible demon escapes the Altar and the crew and passenger number begins to drop, those remaining must quickly uncover the mystery surrounding the ancient Abbey before it destroys them all.
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