USS Intrepid (NCC-1631)

The USS Intrepid (NCC-1631) was a Federation Constitution-class heavy cruiser in service to Starfleet in the mid-23rd century. As of 2268, the ship was crewed almost entirely by Vulcans.

Starfleet service
In 2267, the Intrepid was undergoing repairs in maintenance section 18 at Starbase 11. The base commander, Commodore Stone, rescheduled the Intrepid's repairs, upon giving the USS Enterprise "Priority 1" status on stardate 2947.3, after being damaged in an ion storm.

In 2268, the Intrepid worked in conjunction with Starbase 6, in conducting a mission to investigate the loss of contact with solar system Gamma 7A in Sector 39J. While traversing that sector of space, the Intrepid encountered an unknown dark zone which was, unbeknownst at the time, slowly killing the ship's crew.

On stardate 4307.1, Starbase 6 lost contact with the Intrepid. A rescue priority was issued to the Enterprise to investigate the loss of the Intrepid in an unknown dark zone. En route, Commander Spock telepathically sensed the crew of four hundred Vulcans die.

On stardate 4309.2, the Enterprise established that the thing which destroyed the Intrepid and the Gamma 7A system was an incredibly huge but simple cellular being whose energies were totally destructive to all known life. The crew of the Enterprise destroyed the form, which was determined to be nourishing itself for reproduction.