An Enterprise lieutenant serving as navigator in 2267 when the ship reached the Berthold-ray-soaked colony world Omicron Ceti III, shortly before the crew fell under the spores' influence.
Lieutenant Painter appears in the episode This Side of Paradise. He is at the navigation console as the Enterprise enters orbit of Omicron Ceti III, where Kirk expects to find that Elias Sandoval's agricultural colony has perished.
The colonists prove to be alive and unnaturally healthy, protected by spores that also bring a blissful indifference to duty. The spores spread to the landing party and then to the ship, and the crew beam down in a body, abandoning their stations until Kirk is left alone on the bridge.
Painter is one of the junior officers seen before discipline dissolves, and like the others he returns to duty after Kirk and Spock break the spores' hold with a subsonic signal. He was played by Dick Scotter.