Tom Tyler seems an odd choice to play Kharis, as he was not a horror star. In fact, I can't think of another horror movie that he was in. He was mainly known for Westerns. He played heroes in a lot of low budget B Westerns (like the Three Mesquiteers series), and supporting parts (often as villains) in A Westerns (Stagecoach, San Antonio, Red River). He also played superheroes (the Phantom and Captain Marvel) in two serials.