Re: Is Spock the main character of TOS?
The main character for me in TOS has always been Kirk. If you go to the original concept, the main character was The Captain. Spock was always a secondary character, but the size of his role in the series became larger due to fan response in the 1960s.
Dr. Howard, Dr. Fine, Dr. Howard: For duty and humanity! --Men in Black (1934)