An episode of unknown number from the Original Series.
Synopsis[]
The NSEA Protector butts into an impenetrable magnetic shield with reflective qualities. As the crew tries to figure how to penetrate the wall, there's a slight shift in magnetic alignment and Lt. Madison falls to the other side through a crack in the time-space continuum. As always, our good Commander must save Lt. Madison, by blasting through the shield, or traveling eons in the other direction to find her. He finds a crack in the mirror by facing his worst fear - the fear that though he has repeatedly shown valor in the line of duty, he will one day lack courage at a crucial moment.