The best episode written by Leroy Cronin is "Let That Be Your Last Battlefield", rated 7/10 from 31 user votes. It was "directed by Herb Wallerstein". "Let That Be Your Last Battlefield" aired on 1/10/1969 and is rated 0.3 point(s) higher than their second highest rated, "Spectre of the Gun".
The Enterprise encounters two duo-chromatic and mutually belligerent aliens who put the ship in the middle of their old conflict.
Director: Herb Wallerstein
Writer: Leroy Cronin
Having been found trespassers into Melkotian space, Captain Kirk and his companions are sent to die in a re-enactment of the gunfight at the O.K. Corral.
Director: Vincent McEveety
Writer: Leroy Cronin