Tam Elbrun (2366)
Tam Elbrun (played by Harry Groener) was a Betazoid Starfleet first-contact specialist, whose unusual telepathic abilities led him to be assigned to many first contact situations involving unusual species. Whereas most Betazoids only gained their telepathic abilities at adolescence, when they where able to control them, Tam was born with these telepathic abilities already "switched on" without the natural Betazoid ability to "tune out" background thoughts from others. Tam suffered from a history of mental instability and spent some time as a psychology patient at a university on Betazed attended by Deanna Troi during the 2350s. Tam would be one of Troi's patients at that time.
His name gained infamy following his involvement in the Ghorusda Disaster, in which 47 Starfleet officers from the USS Adelphi were killed. Tam would later blame the incident on him becoming overly involved with the Ghorusdans and failing to adequately advise Captain Darson of Ghorusdan customs.
Tam was interested in the minds of non-humanoid lifeforms, whose thoughts relaxed him.
In 2366, Tam Elbrun was stationed on Chandra V, until he was transferred to the USS Enterprise-D, from the USS Hood, to establish mental contact with the alien intelligence of an organic starship codenamed "Tin Man", discovered in orbit of the dying star Beta Stromgren. The objective was to establish contact before the Romulans, who had dispatched two warbirds to claim the alien. En route, Tam intimated to his old friend, Deanna Troi, that Tin Man had already initiated preliminary contact with him.
Tam also developed a friendship with Data, who had no thoughts that Tam could read, providing Tam with much needed relief.
Upon the Enterprise's arrival at the star, a Romulan Warbird fired on it before heading into the system. Tam sent Tin Man, whose real name was Gomtuu, a telepathic warning, to which the being responded by emitting an energy wave that destroyed the warbird and caused serious damage to the Enterprise. With the star's explosion imminent and the second warbird closing, Captain Jean-Luc Picard asked Tam to coax Gomtuu into returning with them to the safety of Federation space. Tam explained Gomtuu's desire to commit suicide after the long-ago death of its crew, and asked to be transported aboard to establish personal contact. However, Picard was hesitant, questioning the loyalties that had caused Tam to protect Gomtuu at a risk to the Enterprise.
When the second Romulan vessel arrived to destroy Tin Man, Picard sent Tam and Data to communicate with the being. Once aboard, Tam established full mental contact with the ship. Gomtuu returned Data to the Enterprise and sent both the Federation and the Romulan vessels hurtling away from the star. Shortly afterwards Beta Stromgren went supernova, but Gomtuu was nowhere to be found. Data explained that Tam chose to remain with Gomtuu, having found at last the mental peace that he had searched for all his life. (TNG: "Tin Man")