Kirk Acevedo by Maury Phillips/WireImage.co
Kirk Acevedo ( The Black Donnellys Oz) and Mark Valley ( Boston Legal) have joined the cast of Fox's Fringe, a $10 million sci-fi pilot from Lost boss J.J. Abrams that concerns a female FBI agent who works with an institutionalized scientist to investigate unexplained phenomena. Both actors are playing FBI agents.

A Warner Bros. rep tells TVGuide.com there is nothing to report yet regarding the casting of the two leads.