Lee Montgomery as Danny

Joseph Campanella as Cliff Kirtland

Arthur O'Connell as Bill Hatfield

Rosemary Murphy as Beth Garrison

Meredith Baxter as Eve Garrison

Kaz Garas as Joe Greer

Paul Carr as Kelly

Richard Van Vleet as Reade

Kenneth Tobey as Engineer

James Luisi as Ed

Lee Paul as Careu

Norman Alden as Policeman

Scott Garrett as Henry Gray

Arlen Stuart as Mrs. Gray

Ric Drasin as George

Frank Farmer as Police Officer (uncredited)

Bob Harks as Observer on Sidewalk (uncredited)

Bern Hoffman as Truck Driver (uncredited)

Kenner G. Kemp as Onlooker (uncredited)

John Rayner as Hydrex Pest Controller (uncredited)

Leoda Richards as Onlooker (uncredited)

Tom Steele as Fireman Covered with Rats (uncredited)

Hunter von Leer as Police officer with camera (uncredited)