* Jaime Sommers: played by Michelle Ryan
* Dr. Will Anthros: played by Miguel Ferrer
* Sarah Corvus: played by Katee Sackhoff
* J.D. "Jace" Bennett: played by Chris William Martin
* Anthony "Beck" Bechner: played by David Anders
* Dr. Erica "E" Evans: played by Maren Holzer
The series also featured recurring guest roles from many well-known actors, including:
* Mark Sheppard as Oscar: A former associate of Dr. Anthros who becomes a potential enemy to Jaime.
* Kevin Sorbo as Dr. Nathan "Nate" Krueger: The scientist who develops the bionic enhancements.
* Alan Dale as Dr. Frank "Frankie" Powers: A rival scientist who wants to capture Jaime.
* Melissa Joan Hart as Heather: A woman who tests the limits of Jaime's compassion.
This is just a sampling of the actors who appeared in the series. You can find a more comprehensive list by looking up the series on IMDb.