Commander Benjamin Sisko (Avery Brooks) heads the crew of Deep Space Nine -- including Odo (Rene Auberjonois), Worf (Michael Dom), Dax (Terry Farrell) and others -- as it travels through space, trying to keep both the ship and the areas it travels safe, secure and free. One of the first (and greatest) challenges the intrepid voyagers face is the violence of the Dominion, a group composed partially of the shape-shifting Changelings. 
