A condemned cowboy races to clear his name and become a hero to the Union by rescuing the creator of the rapid-firing Gatling Gun from the greedy kidnapper who's holding him for ransom. Disgraced after being convicted of participating in the so-called "Gatling Affair," Captain Chris Tanner (Robert Woods) realizes that his time is quickly running out. In order for Captain Tanner to prove his innocence he'll have to produce both Richard Gatling and his destructive invention. Unfortunately for Captain Tanner, they're currently being help by sadistic criminal Tapas (John Ireland), who's demanding a $1 million each for the man and his gun. Should Captain Tanner succeed in defeating Tapas and bringing Gatling back alive, he'll have all the evidence he needs to walk away a free man; should he fail, he'll wind up swinging from the gallows in the dusty desert winds.