"United" is the 13th episode of the fourth season of the American science fiction television series Star Trek: Enterprise and the 89th episode overall. It was first broadcast on the UPN network on February 4, 2005. It is the second of a three-part story which included the previous episode "Babel One", and the following episode, "The Aenar". "United" was written by Judith and Garfield Reeves-Stevens from a story idea by show runner Manny Coto. It was directed by David Livingston, his third of the season.