EXCLUSIVE: Another Star Trek legacy character is set to appear in Star Trek: Strange New Worlds Season 3. Dr Roger Korby is set to be played by Irish-American actor Cillian O'Sullivan. The reveal of Korby's appearance in Season 3 would be no surprise to anyone paying attention through Season 2. Korby, in particular, his future with Nurse Chapel (Jess Bush), was the focus of a major story arc.