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A New Day in the Old Town
Here is a partial description of the episode from Wikipedia:
Olivia's SUV is discovered to have caused a car accident in downtown Manhattan. After the crash, the other car driver involved runs away and kills a civilian, then takes his form, revealing him to be an extra-universal shapeshifter. FBI agents, led by Agent Amy Jessup, arrive at the crash site, only to find Olivia's car empty. Walter, after tampering with the car's equipment, manages to bring Olivia back to "our world," however severely injured and brain-dead. Amy Jessup, new to the world of Fringe Division, is stunned by seeing this and searches for more information on what they do. Meanwhile, Philip Broyles travels to Washington, D.C., in order to present the US Senate with reasons not to shut down his FBI division.Go here to read the rest of the plot summary.
If you have never watched "Fringe" now is the time to do so as it is an excellent series. And if you happen to miss it on TV, you can always catch it at Fancast.Com.