The Rio Theatre, 335 N. Last Chance Gulch, September 1936. Playing was Warner Bros. "Anthony Adverse", with Frederick March. Helena newspaper ads (see below) touted it as a "World Premiere", but in fact the film had premiered in Los Angeles and New York on July 29.

The Rio staged its grand opening on Christmas Day of 1934. The newspaper archive history of the venue is somewhat unclear. In 1936, the theater was sold to the Fox-West Theater Corp. It became the Vigilante Theatre around 1949, and was out of business by 1956. The building is still standing, but without the art deco marquee and paint-job. Numerous business have operated at the address over the decades.