Bakish identified six "flagship" brands after he became CEO and president of Viacom in late-2016: BET, Comedy Central, MTV, Nickelodeon, Nick Jr., and Paramount. With the departure of Zarghami, all of those brands have now changed leadership over the past year-and-a-half as part of Bakish's reorganization plans. Deadline obtained the letters that Bakish sent to Nickelodeon and Viacom staff today.