Before he became Carl "Helo" Agathon in the re-imagined Battlestar Galactica, one of Tahmoh Penikett's early roles in television was as the Replicator Third in SG-1 Season Six's "Unnatural Selection." We are delighted to welcome him to our show to talk about his brief time on Stargate, as well as his broader career in some of the best television ever created.