Yesterday, we showed you an intriguing poster for the two-hour series finale of Fringe, which starts Friday, January 18 at 8 PM ET with "Liberty, followed by "An Enemy of Fate" at 9 PM ET. This two-minute trailer teases how Peter (Joshua Jackson), Olivia (Anna Torv), and Walter (John Noble) prepare for their final battle with the Observers. Will the Fringe team save the universe and end the Observers' reign of terror? Find out on Friday night!