A Betazoid science adviser found catatonic as the only survivor of the USS Brattain in Night Terrors, whose mind carries the same telepathic message that reaches Deanna Troi.
Andrus Hagan is a Betazoid who served as science adviser aboard the science vessel USS Brattain. He appears in the fourth-season episode Night Terrors, set in 2367.
The Enterprise finds the Brattain adrift in a binary system with the rest of its crew dead, apparently at one another's hands. Hagan is alive but unresponsive, and Troi can pick up only fragments from him about eyes in the dark and a single moon that circles.
As the Enterprise becomes caught in the same Tyken's Rift and its crew, deprived of dreaming sleep, begin to break down, Troi recognises the phrases from her own nightmares. They are a call for help from another ship trapped on the far side, and Hagan's Betazoid mind had been overwhelmed by receiving it.