International terrorists attempt to kidnap a wealthy couple's child. Their plan comes unstuck when a deadly Black Mamba, sent by mistake instead of a harmless snake, escapes and the terrorists and several hostages are trapped in the boy's London home.
Klaus Kinski
as Jacques Müller (Jacmel)
Oliver Reed
as Dave Averconnelly
Nicol Williamson
as Cmdr. William Bulloch
Sarah Miles
as Dr. Marion Stowe
Sterling Hayden
as Howard Anderson
Cornelia Sharpe
as Ruth Hopkins
Lance Holcomb
as Philip Hopkins
Susan George
as Louise Andrews
Michael Gough
as David Ball
Mike Gwilym
as Det. Constable Dan Spencer
Edward Hardwicke
as Lord Dunning
John Forbes-Robertson
as Sgt. Nash
