Must-Watch Finales: 31 Super Season-Enders

Fringe (May 13, Fox)

Olivia and Walter have been uncomfortable allies this season, and that will continue when they go "over there" together. In the alternate universe, there are rumblings that we'll meet several doppelgangers, including Walternate, who we met in the chilling '80s flashback "Peter." It won't end well, as one member of the "over here" team will die.