William Campbell played both Captain Koloth and Trelane
Charles Macaulay played Prefect Jaris and Landru
Skip Homeier played Melakon and Dr. Sevrin
Mark Lenerd played Sarek and a Romulan Commander
Diana Muldaur played Dr. Miranda Jones and Ann Mulhall (AND Dr.Pulaski in TNG)
Am I missing anyone?
Charles Macaulay played Prefect Jaris and Landru
Skip Homeier played Melakon and Dr. Sevrin
Mark Lenerd played Sarek and a Romulan Commander
Diana Muldaur played Dr. Miranda Jones and Ann Mulhall (AND Dr.Pulaski in TNG)
Am I missing anyone?