Girls star Allison Williamshas been cast in the title role of NBC's Peter Pan Live!, the network announced Wednesday. In addition to Williams singing talent, which showcases at every opportunity on Girls, expect to see Williams to exhibit some truly "dynamic flying" in the Dec. 4 telecast, according to the announcement. NBC's chairman Robert Greenblatt added that Williams "will bring the perfect blend of 'boyish' vulnerability and bravado to save the day against Christopher Walken's powerful Captain Hook."