The Enterprise is transporting its first Captain, Robert April to Babel, where he will reluctantly accept his retirement. When the Enterprise attempt to stop an unidentified vessel on a collision course with the Beta Niobe nova, the ship accidentally pass into an alternate dimension, where time flows in the opposite direction. The crew of the Enterprise rapidly begins to grow younger in age, and soon become unable to man the consoles.
The TV Archaeologist
Did You Know?
Robert April's Starfleet dress uniform was based on similar costumes used in numerous episodes of the original Star Trek series (beginning with "Court Martial"). See more
In Karla Five's first message to the Enterprise, she's speaking in reverse. Later, in her reverse-time universe, the crew can understand her (and her, them) because, as Spock says, their brains are now in reverse. If this true, then Karla's brain should likewise have been reversed when she entered the forward-time universe, allowing her to speak forwards. See more
[referring to Karla Five
I can understand her now without the aid of the Universal Translator.
Apparently our brains are also working in reverse, Captain.
Referenced in After Trek: Choose Your Pain