Pernell Roberts & Randolph Scott in Ride Lonesome - Scenes From Pernell Roberts [ Before Bonanza ] - 1959 br NOTEDavid Dortort discovered Pernell Roberts when he was working on the stage at Universal Studios. He saw Pernell in the newly released "RIDE LONESOME" film and was highly impressed with him as well, and so Pernell was in the Cast Of Bonanza as Adam Cartwright.