Lou Diamond Phillips, Alaina Huffman Lou Diamond Phillips, Alaina Huffman

The ship is fast filling up on Sci Fi Channel's Stargate Universe, with Lou Diamond Phillips (Numbers, La Bamba) and Alaina Huffman (Smallville's Black Canary, Painkiller Jane) being the latest additions to the crew, TVGuide.com has learned exclusively.

Phillips has been cast as Colonel Telford, a lifelong military man who becomes the chosen leader when a starship's crew inexplicably finds itself aboard an ancient vessel locked into an unknown course.

Huffman, meanwhile, will play Tamara Johansen, a strong-willed — if inexperienced — field medic who will need to rise to the occasion to treat the seriously wounded.

Other cast additions include Ming-Na (ER, as a human resources exec) and Elyse Levesque Phillips (Smallville, playing a senator's daughter).

These four new arrivals join the previously announced Robert Carlyle, Justin Louis, David Blue, Jamil Walker Smith and Brian J. Smith.

Stargate Universe is expected to premiere in October with a two-hour movie event.