The Counter-Clock Incident

The Enterprise is taking it's first Captain, Commodore Robert April, and his wife, Sarah, to Babel, when it sees a ship flying into a super nova. The Enterprise tries to help by locking a tractor beam onto it, but is pulled into a negative universe where time flows backwards. The pilot of the alien ship agrees to help them get back, but the crew is rapidly growing younger and will soon be unable to operate the ship.