Sam Neill as Damien Thorn

Rossano Brazzi as De Carlo

Don Gordon as Dean

Lisa Harrow as Kate Reynolds

Barnaby Holm as Peter

Mason Adams as President

Robert Arden as American Ambassador

Leueen Willoughby as Barbara

Marc Boyle as Brother Benito

Milos Kirek as Brother Martin

Tommy Duggan as Brother Mattius

Louis Mahoney as Brother Paulo

Richard Oldfield as Brother Simeon

Tony Vogel as Brother Antonio

Arwen Holm as Carol

Hugh Moxey as Manservant

William Fox as Diplomat

John Baskcomb as Diplomat

Norman Bird as Dr. Philmore

Marc Smith as Press Officer

Arnold Diamond as Astronomer

Eric Richard as Astronomer's Technician

Richard Williams as Vicar

Stephen Turner as Stigwell

Al Matthews as Workman

Larry Martyn as Orator

Frank Coda as Orator

Harry Littlewood as Orator

Harvey Bernhard as US Embassy employee (uncredited)

Jeremy Bulloch as News reporter (uncredited)

Hazel Court as Champagne Woman (uncredited)

Guy Standeven as Auction Attendee (uncredited)

Ruby Wax as US Ambassador's secretary (uncredited)