5x13 An Enemy of Fate
First Aired: Jan. 18, 2013 on FOX
Summary: The Fringe team engages a desperate plan as Olivia embarks on a dangerous and otherworldly journey into the unknown. Then, Peter, Olivia, Walter, Astrid and Broyles face off against the Observers in one final and extraordinary battle for the fate of mankind.
Guest Stars[no credits found]