In the hugely popular fourth season of Star Trek: Voyager, the crew encounters the Borg Collective and the mysterious Species 8472 - and takes on an unlikely crewmate: Jeri Ryan as Seven Of Nine. Season highlights include the resolution of the Season Three "Scorpion" cliffhanger, "The Killing Game," "Living Witness" and the two-part thriller, "The Year of Hell."

DVD extras include the featurettes "Braving The Unknown: Season Four," "Time Capsule: Seven Of Nine," "Time Capsule: Harry Kim," "The Birth of Species 8472" and "The Art of Alien Worlds," plus, a photo gallery.