Release Message:  When Captain Kirk (William Shatner) and the Enterprise attempts to stop an unidentified vessel on a collision course with the Beta Niobe nova, they accidentally pass into an alternate dimension where time flows in the opposite direction.

Description:  The Enterprise is transporting its first Captain, Robert April to Babel where he will reluctantly accept his retirement. When they attempt to stop an unidentified vessel on a collision course with the Beta Niobe nova, they accidentally pass into an alternate dimension where time flows in the opposite direction. Thus, the crew of the Enterprise rapidly begins to grow younger in age and soon becomes unable to man the consoles Wikipedia: The Enterprise finds itself drawn into a parallel universe where time flows backward.