Watch Sadisflix. Riders of the Dusk is another of Monogram's formula Whip Wilson westerns. Since the studio couldn't build an entire film around Wilson's bullwhip prowess, a plot was called for. This time around, it's the one about a U.S. marshal who searches high and low for a mysterious masked desperado. The mystery angle is minimal, since seasoned movie fans will be able to determine the mystery person's identity within 15 minutes. As always, Andy Clyde is a tower of comic strength as Whip Wilson's grizzled old sidekick.