"Babel One" is the twelfth episode of the fourth season of the American science fiction television series Star Trek: Enterprise, and originally aired on January 28, 2005. The episode was written by Mike Sussman and André Bormanis, and directed by David Straiton. "Babel One" was the first of a three-part story which continued in the episodes "United" and "The Aenar". The arc was intended to precede the Romulan War which had been mentioned in previously aired episodes of the franchise, while "Babel One" was a reference to the Star Trek: The Original Series episode "Journey to Babel".