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As was customary in his late Monogram westerns, Johnny Mack Brown plays an undercover agent in Colorado Ambush. Brown is sent to Colorado to stem the activities of a particularly vicious outlaw gang. The leader of the gang is played by Myron Healey, who also wrote the script. The best sequence involves Healey and saloon gal Christine McIntyre; it's the standard "We're neither one of us any good," dialogue exchange, but it's played with depth and finesse. Myron Healey also wrote and co-starred in the subsequent Johnny Mack Brown oater Texas Lawman (1951).