Steth
Steth was one of many victims of a lifeform with the ability to take over the bodies of other humanoids. This lifeform had perfected a DNA exchange by which he could occupy other bodies and transfer that person into the body he was occupying. Steth was left inside the form of a female humanoid of another species -- the lifeform's previous victim -- when he encountered this lifeform.
In 2374, his ship was damaged and the lifeform posing as Steth was transported aboard the USS Voyager. Once onboard, he won the friendship of the crew, most notably Tom Paris, who had helped repair his ship. After the ship was repaired, the lifeform posing as Steth switched bodies with Paris, leaving him in his ship and sending him away.
The lifeform remained on Voyager to live out Paris' life. On Voyager, the lifeform began to lose control and exhibit erratic behavior. He fought with Seven of Nine, and he became intoxicated while on duty. The lifeform attacked Kathryn Janeway when she became suspicious of him. He was stunned by Tuvok and taken to sickbay.
Paris in the form of Steth, along with the real Steth in the form the lifeform had previously inhabited, returned to Voyager, only to find that the lifeform had once again switched bodies with Kathryn Janeway. With the lifeform in Janeway's body, he attempted to escape taking a Type-9 shuttlecraft with a modified coaxial warp drive. Paris, noticing his actions, convinced Chakotay that the lifeform had stolen his body. Chakotay allowed Paris and Steth to pursue the lifeform, who stopped him before he could warp away. Back on Voyager, they managed to force the lifeform back into the body of his previous victim, returning Tom and Steth into their original bodies. They then turned him over to the local authorities whose job it was to trace the former bodies the lifeform had occupied and return them to their original owners. (VOY: "Vis à Vis")
- Steth was played by Dan Butler.