"Before and After" is the 63rd episode of the science-fiction television series Star Trek: Voyager, and the 21st episode of the third season. It foreshadows events seen in a later episode, "Year of Hell". The episode debuted on UPN on April 9, 1997. This episode is focused on the alien Kes, played by actress Jennifer Lien, in a plot involving a complicated time travel paradox with the USS Voyager. In this science fiction show, the USS Voyager is a 24th century star ship stranded on the other side of the Galaxy as Earth, and must make its way back over what may be decades with motley collection of Starfleet, Maquis, and aliens as crew.