Robert Preston as Alex Dennison

Lynn Redgrave as Monica Welles

Patrick Macnee as David Mathews

Lawrence Pressman as Lloyd Andrews

William Russ as Frank Heller

Madolyn Smith Osborne as Karen Daniels

Jeff Goldblum as Leo Gibbs

William Daniels as Walter Lamb

John Finnegan as Damon

Nicholas Mele as The First Officer

Vahan Moosekian as The Moving Man

Charles Robinson as The Second Officer

Wallace Rooney as Ernie

Buck Young as Lieutenant McElroy

Sergio Kato as The Third Officer