There is a change at the helm of Fox’s midseason drama Alcatraz, from Warner Bros. TV and J.J. Abrams’ studio-based Bad Robot. Co-creator/executive producer/showrunner Elizabeth Sarnoff is leaving the time-travel series, which will now be co-run by Jennifer Johnson and Daniel Pyne. Chase creator/executive producer and Lost alumna Johnson joined Alcatraz after the pilot as a consulting producer. Two months ago, she was quietly elevated to executive producer and co-showrunner alongside Sarnoff. Sarnoff, who wrote the version of the project that was picked up to pilot and then to series by Fox from an earlier incarnation by Steven Lilien and Bryan Wynbrandt, is now stepping down over creative differences, with feature writer Pyne (Fracture) coming in as an executive producer and co-showrunner alongside Johnson.