It started as a movie released in 1985, which was panned by critics and did poorly in theaters, but found a new life on video and television. Then in 1992, a syndicated series was started based on the same premise as the movie, but with a different lead character. I discovered the series when it was in its third season. The series ran a total of five and a half seasons, ending in 1998. The Raven , ran for one season in 98-99, but didn't do very well and has been canceled.
Immortals live as ordinary people unless and until they die a violent death.
After that, they revive and could live forever, physically frozen as they were when they first died. On the down side, Immortals can't have children. None of them knows exactly what the Prize is, but they all know it involves fantastic power. The fights usually take the form of duels with swords or other edged weapons, because the only way to kill an Immortal is to take his or her head. It sounds weird, but handled properly it can be and has been the basis for some very good drama.