John Wayne once again goes undercover to catch a wanted outlaw in this average entry in his 1934-1935 Western series for Monogram Pictures. Wayne plays John Carruthers, a U.S. marshal, and his quarry is the Polka Dot Bandit, aka Danti (Yakima Canutt), who has taken off with a 4,000-dollar pay roll. As John soon learns, Danti is in the employ of Malgrove (Edward Peil Sr.), a supposedly upstanding citizen who is secretly trying to starve the good people of Yucca City. Unbeknownst to the townsfolk, a valuable ore runs right through the area and Malgrove is plotting to buy the land on the cheap. Blue Steel was produced at Hollywood's General Service Studios with exteriors filmed at Big Pine, CA.