Only three episodes remain of Fringe Season Four.

And while fans anxious await word on a 2012-2013 renewal, Fox has released the official synopses for this Friday's "Worlds Apart," as well as the two-part season finale. Consider yourself adequately spoiler warned and read on for a few teases of what's to come...

April 27: “Worlds Apart”
Team members on both sides, including Olivia and Peter, continue to fight for a common cause, and there are shocking developments tied to the Cortexiphan children.

May 4: "Brave New World, Part 1"
In the first of a thrilling two-part season finale, a mysterious Fringe event, causing people to spontaneously combust, forces Walter to revisit his painful past, while the Fringe team faces off against David Robert Jones (guest star Jared Harris) to save the world, or worlds.

May 11: “Brave New World, Part 2"
In the climactic conclusion of the Season Four finale, the Fringe team is pushed to the breaking point as they desperately attempt to prevent a catastrophic event that threatens the lives of everyone.

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