Following her discovery at the end of Season One, Hanna now knows she is not the only young woman with unparalleled skill and elite training. The Utrax program has produced a whole contingent of highly trained teenagers whose development is about to reach the lethal second phase. Esm Creed-Miles reprises the title role of Hanna and Mireille Enos returns as CIA operative Marissa Wiegler in a season that introduces Dermot Mulroney as Utrax overseer John Carmichael.