via press blurb:
NEW CASES AND ENDLESS IMPOSSIBILITIES BEGIN
WHEN “FRINGE” SPRINGS FORWARD BY REVEALING THE PAST ON THURSDAY, APRIL 1, ON FOX
In “Peter,” the spring premiere episode of FRINGE airing Thursday, April 1 (9:00-10:00 PM ET/PT), Walter (John Noble) flashes back to 1985 while explaining Peter’s (Joshua Jackson) otherworldly origins to Olivia (Anna Torv). Also, Peter’s mother (guest star Orla Brady) is introduced, and details of the neighboring world reaffirm that there is more than one of everything.
Here's the "10 Things You Need To Know About Fringe":