Flashbacks are all the rage on TV these days.

Sometime they're effective (Lost). Other times, they feel extraneous, adding nothing to character development or ongoing storylines (Grey's Anatomy episode "Time Warp").

But we're gonna assume the April 1 Fringe episode falls into the former category, as the Fox preview below teases that viewers will "see how it all began" when this drama returns after a long hiatus. See for yourself:

[video url="http://www.tvfanatic.com/videos/fringe-return-promo/" title="Fringe Return Promo"] [/video]

What, specifically, lies ahead on the show? Browse around our section of Fringe spoilers to find out.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.