Magen is a psionic member of the Elysian ruling council in The Time Trap who senses that the Klingons have planted a bomb on the Enterprise and raises the alarm.
Magen appears in the Animated Series episode The Time Trap. She lives in Elysia, a pocket of space inside the Delta Triangle where ships of many species have been stranded for centuries and their descendants have formed a peaceful society.
She sits on the Elysian council under Xerius, where her mental gifts are used to watch for violence, the one thing the community will not allow. When the Enterprise and Kor's Klothos are trapped, the council warns both crews.
The two ships link up to break out together, but the Klingons hide an explosive aboard the Enterprise timed to go off once they are free. Magen senses the plot, and Xerius warns Kirk in time for the device to be found and thrown clear.