Babylon 5 "Deathwalker" - You Are Not Ready

Deathwalker is an episode from the first season of Babylon 5, which is collectively entitled Signs and Portents. This clip is from Season 1 Episode 9.

Na'Toth attacks an alien woman that has just arrived on the station, claiming that she is the Dilgar war criminal Jha'dur — known as Deathwalker. Deathwalker is a scientist that has developed a way to give immortality, yet another person must die in order for this to happen.