A party of tourists -- including a state senator, a park ranger who was her one-time lover, a cantankerous professor, and an escaped convict -- are trapped deep inside the caverns of an unnamed national park, rescued briefly, and then caught in a second cave-in.

Reparto

Dennis Cole

Ranger Gene Pearson

Susan Sullivan

Senator Kate Lassiter

Leslie Nielsen

Joe Johnson

Ray Milland

Prof. Harrison Soames

Julie Sommars

Liz Johnson

Sheila Larken

Ann Soames

Lonny Chapman

Walt Charles

James Olson

Tom Arlen

Ivan Bonar

Doctor at Prison

David Westberg

Larry Munson

Todd Martin

Herb

Joseph Della Sorte

Cooper

William Bryant

Jack Miller

Michael Masters

Ray