When did Star Trek first air?
Where No Man Has Gone Before
Kirk decides that they need to know what happened to the Valiant, and the Enterprise crosses the edge of the galaxy where it encounters a strange barrier which damages the ship's systems and warp drive, forcing a retreat. At the same time, nine crew members are killed and both helmsman Gary Mitchell and ship's psychiatrist Dr. Elizabeth Dehner are knocked unconscious by the barrier's effect. When he awakens, Mitchell's eyes glow silver, and he begins to display remarkable psychic powers.