The Enterprise tries to save an unidentified ship plunging into a supernova but is dragged into a universe where time runs backwards. Their only hope to return home is Commodore Robert April, the first commander of the Enterprise, who is onboard on a retirement trip.moreless
The Enterprise and a Klingon ship must join forces to escape from a pocket universe that has been trapping starships for centuries.
The crew of the Enterprise finds themselves shrinking after being bathed with radiation.
The crew encounters Harry Mudd again, who is selling a fake love potion.
In orbit around a dead star, the Enterprise comes across a huge starship inhabited by a parasitic life form that threatens the entire ship.