Em/3/Green, also referred to simply as Em, was a 23rd centurybeing of an unknown insectoid species. Although physically weak, and overtly cautious, he was known for being a thief and an expert lockpick. He also seemed to have an aptitude for machines and circuitry.
In 2269 when the Vedala sent teams to recover the stolen artifact, "Soul of the Skorr" from an unstable "mad planet" he was sentenced to the quest along with Captain Kirk, Commander Spock, Tchar, Sord, and Lara. (TAS: "The Jihad")