Syfy's "Stargate Universe" has cast Robert Kneppermand Julie McNiven ("Supernatural," "Mad Men") as guest stars to the second season of the hit series. Knepper joins the cast for a six-episode arc and will portray Simeon, a member of the Lucian Alliance. McNiven will also join the cast for a five-episode arc, portraying Ginn, a member of the Lucian Alliance. Season Two of "Stargate Universe" premieres on Syfy fall 2010.
Source: Coming Soon