 Casting director Bill Shepard was in charge of filling additional roles. He combed through initial auditions with promising actors, then presented his choices to Shatner. Both men called the actors back as many as two or three times before each role was cast. Additional players include Todd Bryant as Klingon Captain Klaa, with Spice Williams-Crosby as Vixis, Klaa's lieutenant. Bryant was playing ping pong at a beach party when a casting director offered him the role. Bryant performed his audition twice, as Shatner requested that he repeat his performance speaking in Klingon. Williams-Crosby thought Vixis was Kirk's girlfriend when she arrived for her audition, but recalled afterwards that it was "fun" to play a villain. David Warner, Charles Cooper and Cynthia Gouw play the Federation, Klingon, and Romulan ambassadors to Nimbus III. Warner did not audition, but agreed to the role after Shatner swore that his character would survive the film. The director originally intended George Murdock to play the Klingon diplomat Korrd, but changed his mind on seeing Cooper's performance. Murdock was recast as the "God" entity. Bill Quinn played McCoy's father in one of his last roles. Producer Harve Bennett made a cameo as a Starfleet admiral.
