Lieutenant commander Helman was a Starfleet officer who served as the second science officer aboard the USS Enterprise, under the command of Captain James T. Kirk, in the 2260s.
History
Helman was tall and thin with close-cropped blond hair and a protuberant Adam's apple.
During the Enterprise's mission to Kyros in 2269, he stood in for Spock on bridge duty. (TOS novel: Spock, Messiah!)