Lieutenant Daniels was the tactical officer and the security chief aboard the USS Enterprise-E serving under the command of Captain Jean-Luc Picard from at least 2373 to 2375. (Star Trek: First Contact; Star Trek: Insurrection)
Daniels was part of the defense of the Enterprise-E against the Borg, and took part in the failed attempt to reach main engineering and destroy the hive mind. Later he reported to Worf that the Borg controlled over half the ship, but had mysteriously stopped advancing.
When the Borg resumed their attacks, he reported to Captain Picard that the weapons were no longer effective, but when ordered to return to the ship's defense, he did so without question, despite Worf questioning Picard's orders. (Star Trek: First Contact)
In 2375, Daniels was present on the Enterprise-E's mission to the Ba'ku planet to investigate Data's malfunction. When it became clear that a forced relocation of the Ba'ku was in progress, Daniels remained on the Enterprise when it journeyed to the edge of the Briar Patch to send a message to Starfleet to get them to withdraw their support.
Lieutenant Daniels was played by actor Michael Horton.
The ebook The Oppressor's Wrong gives his full name as Pádraig Bréanainn Daniels. He was assigned to the Enterprise-E after working as a demolition expert on Earth. He spent six months away from the Enterprise on paternity leave in 2374, during which his duties were covered by several officers, including Rowan, Rhea McAdams, and Baeta Leyoro. After the end of the Dominion War, he retired and was replaced by Christine Vale.
The First Contact edition of the Star Trek Customizable Card Game, released in 1997, after his debut in First Contact but before receiving the name "Daniels" in Insurrection, gives his name as Thomas McClure. The Star Trek: The Next Generation Companion (? ed., p. ?) confirms that the security officer in First Contact is Lt. Daniels and not another character.