When Uhura picks up a mysterious comms signal from future herself, a time travel adventure kicks off and her two selves have to work together to save Scotty. But after P’Uhura ends up on the F’Enterprise and F’Uhura ends up on the P’Enterprise, going hands-on with a space vagina is the only way to set things right. Who got personally thanked for “making the world such an awesome place to be”? Which possible time traveller may have just forgotten all the details? What color is this hole actually? It’s the episode that only has one person following the temporal prime directive.