Sunset On The Desert has Roy playing two roles, Roy Rogers rancher and rodeo star and his evil doppelganger, a gunman in the pay of Douglas Fowley. Fortunately we see far more of the good Roy than the bad Roy because quite frankly Roy just can't cut it as anything less than a cowboy hero.
Fowley has bad Roy and a whole bunch of others trying to get control of a lot of properties in the area. He's got a hold over Judge Frank M. Thomas who thinks his brother who was once the partner of the good Roy's father pilfered some money from the county.
Both the Roys have girl friends, the good Roy is chasing Lynne Carver daughter of the former partner of his dad and Judge Thomas's niece. The bad Roy's got the shapely Beryl Wallace. Needless to say both the women are confused.
I saw an edited version of Sunset In The Desert and a lot was left out, but even so every actor loves the challenge of playing dual roles. But Roy Rogers was not an actor per se, he was a movie cowboy hero. And good what he did, but he should have had a better story. And he just doesn't cut it as a bad guy in the scenes as bad Roy.