The SS Valiant (NCC-S1104) was a galactic survey cruiser that was launched from Earth in 2065. She was one of the first warp driven deep space explorers deployed by Earth and was commanded by Captain Carlos Tarasco.
In December 2069, after exploring for more than four years, the Valiant encountered a magnetic storm and were knocked of course, and was swept into the galactic barrier at the edge of the galaxy. Contact with the barrier resulted in the death of six crewmembers, and led to the mutation of chief engineer, Geirrod Agnarsson, into a psionic super-human. As Agnarsson's powers began to grow he killed several security guards, and Captain Tarasco had no choice but to destroy his own ship, after evacuating his crew in escape pods. Tarasco also launched the ship's disaster recorder, in the hope it would act as a warning to future Earth vessels that came out here.
By early 2070, the Valiant survivors had spent several months in proximity to the barrier; they too began to mutate, eventually developing telepathy and psychokinetic powers. Eventually, the survivors made planet-fall on a Class M planet and established the city of Magnia.
Two centuries later, in 2265, the crew of the USS Enterprise found the Valiant recorder marker, and attempted to traverse the barrier to determine what happened to the Valiant. As with the Valiant, the Enterprise suffered extreme damage and some of it's crew died, with only those with high ESP rating surviving. (ST references: Star Trek Maps, Star Charts, Star Trek Chronology; TNG novel: The Valiant; TOS episode & Star Trek 8 novelization: Where No Man Has Gone Before; ENT episode: "In a Mirror, Darkly")
- The novelization of "Where No Man Has Gone Before" by James Blish, refers to the Valiant as the USS Valiant.