Excelsior-class Federation starship, registry no. NCC-38907. On Stardate 23859.7 (2346), the Intrepid was the first ship from Starfleet on the scene after the Romulan massacre at the Klingon outpost Khitomer. A warp engineer, Sergey Rozhenko, adopted the lone survivor, 6-year-old Worf.
In 2375, while infiltrating Species 8472's Terrasphere 8 in the Delta Quadrant, Commander Chakotay of the U.S.S. Voyager claimed to have just arrived from a three-year tour on the Intrepid. The creature posing as groundskeeper Boothby noted that the Intrepid was patrolling the Romulan Neutral Zone at the time. This, though, was a contrived scenario in 8472's training simulation of the Federation. (In the Flesh)
References: Sins of the Father,