The best episode written by David P. Harmon is "The Eye of the Beholder", rated 8/10 from 3 user votes. It was "directed by Hal Sutherland". "The Eye of the Beholder" aired on 1/5/1974 and is rated 0.7 point(s) higher than their second highest rated, "The Deadly Years".
Telepathic aliens put Kirk, Spock and McCoy in a zoo.
Director: Hal Sutherland
Writer: David P. Harmon
Strange radiation exposes the command crew of the Enterprise to the effects of rapid aging.
Director: Joseph Pevney
Writer: David P. Harmon
The Enterprise visits a planet with an Earth-like 1920s gangster culture.
Director: James Komack
Writer: David P. Harmon