In tonight's two-hour series finale which also happens to be the show's 100th episode, the worlds come to "mind-blowing end" when the team tries a desperate plan as Olivia embarks into the unknown, and then the whole crew faces off against the Observers in one last battle. It's sure to be emotional, but on the bright side, it can't possibly be too disappointing of an installment, right?

"Liberty/An Enemy of Fate" airs tonight starting at 8 PM on Fox. There's also the winter premiere of Nikita at 8 PM on The CW, Part Two of Oprah's Lance Armstrong interview on OWN at 9 PM and the "series premiere" of Best Week Ever on VH1 at 10 PM.

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