"FILE - In this April 28, 2012 file photo, actor Michael J. Fox attends the premiere of ""The Avengers"" during the 2012 Tribeca Film Festival in New York. Fox is planning a return to series TV and will star in a sitcom that's in development at Sony Pictures Television according to people familiar with the situation who spoke on condition of anonymity. (AP Photo/Evan Agostini, file)"