PLATO'S STEPCHILDREN (S3/E10). I couldn't find it. The action beginning at about 47:30 minutes in. Star Trek-The Original Series.
Rare 1968 STAR TREK TOS 35mm Film Clip WORLD IS HOLLOW Spock Kirk's Quarters K13
Rare 1968 STAR TREK TOS 35mm Film Clip SPOCK'S BRAIN Chapel & Bones Collapse K15
Rare 1968 STAR TREK TOS 35mm Film Clip PIECE OF THE ACTION Kirk Spock McCoy J1
Rare 1968 STAR TREK TOS 35mm Film Clip PIECE OF THE ACTION Spock Kirk Bones K31
Rare 1968 STAR TREK TOS 35mm Film Clip WORLD IS HOLLOW Kirk and the Pylon J15
Rare 1968 STAR TREK TOS 35mm Film Clip CHILDREN SHALL LEAD Kirk Grabs Leslie K10
