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. Wingate confronts McInally at his base in Opal Ridge, but is nearly killed. He recovers, thanks to the efforts of an aboriginal tribe and together they attack and defeat McInally.