High Quality Content by WIKIPEDIA articles! The USS Defiant (NX-74205) is a fictional starship in the television series Star Trek: Deep Space Nine (DS9) and the feature film Star Trek: First Contact. The lead ship of her class and one of the Federation`s first purpose-built warships, the Defiant first appears in the DS9 episode "The Search, Part I", after which it plays a significant role throughout the series in the ensuing Dominion War. While the original Defiant is destroyed in the show`s seventh season, Starfleet sends a replacement ship of the same class, the USS Sao Paulo, which receives special dispensation from the Chief of Starfleet Operations to be renamed as the Defiant.