Harry Wingate, a rugged adventurer, is hired by a gem collector to retrieve a priceless opal, known as "The Blue Lightning," from Lester McInally, a super-criminal with an army of killers operating in the Australian outback.

Sam Elliott
as Harry Wingate

Robert Culp
as Lester McInally

John Meillon
as Dr. William Giles

Rebecca Gilling
as Kate McQueen

Robert Coleby
as Ninian

Max Phipps
as Brutus Cathcart

Ralph Cotterill
as Words

Jack Davis
as Jahrgadu

Bob Barrett
as Sullivan

Ray Meagher
as Hale