The original "Daniel Jackson" actor will play the big villain in the follow-up to Joss Whedon's 2012 mega-hit.
The interactive story will be available for mobile devices this fall.
The actress played Dr. Amanda Perry on Stargate Universe.
The 77-year-old actor played Yaozu in two episodes of Stargate Universe.
WWE Studios and Anchor Bay Films have teamed to distribute the Atlantis actor's directorial debut.
The Stargate SG-1 actress is shooting a multi-episode story arc on the hot CW comic book show.
Syfy is sticking with the hit Canadian sci-fi series for another year.