Allan "Rocky" Lane and his trusty stallion Black Jack star in Republic's Black Hills Ambush. Lane plays a U.S. marshal who answers a call for help from his old pal Nugget Clark (Eddy Waller). It seems that someone is staging ruinous raids on Nugget's newly established freight line. Realizing that gang leader Bart (Roy Barcroft) is a lost cause, Lane tries to reform gang member Larry Stewart (Michael Hall), thereby forcing the crooks' evil scheme to collapse under its own weight. The highly forgettable leading lady is played by Leslye Banning. Allan "Rocky" Lane continued turning out low-budget westerns for a full decade after Black Hills Ambush was released in 1952 but is probably best-known as the voice of TV-equine Mr. Ed