Hunter Carson as David Gardner

Karen Black as Linda Magnusson

Timothy Bottoms as George Gardner

Laraine Newman as Ellen Gardner

James Karen as Gen. Climet Wilson

Bud Cort as Mark Weinstein

Louise Fletcher as Mrs. McKeltch

Eric Pierpoint as Sgt. Maj. Rinaski

Christopher Allport as Captain Curtis

Virginya Keehne as Heather

Kenneth Kimmins as Officer Kenney

Charlie Dell as Mr. Cross

Chris Hebert as Kevin

Mason Nupuf as Doug

William Frankfather as Ed, Heather's Father

Debra Berger as Corporal Walker

Eddy Donno as Hollis

Mark Giardino as Johnson

Donald Hotton as Old NASA Scientist

Jimmy Hunt as Police Chief

William Bassett as NASA Scientist

Dale Dye as Squad Leader

Scott Leva as Marine Officer

Steven Lambert as Demolition Man

Debbie Lee Carrington as Drone

Tony Cox as Drone

Sal Fondacaro as Drone

Randall Wulff as Young Marine / Drone