Zosia Mamet's Winter Plans: On 'Girls' and Off Broadway The actress Zosia Mamet will be playing two characters this winter who, apart from being lovelorn, could not be more different temperamentally. Just as she is returning to the HBO series "Girls" in January as the bubbly naïf Shoshanna Shapiro, Ms. Mamet will also make her Off Broadway debut as the downbeat, enigmatic Leigh in Paul Downs Colaizzo's "Really Really," a drama about sexual politics and culture clashes among college students. The MCC Theater production will be staged by David Cromer, the Obie-winning director of the recent Off Broadway productions "Our Town" and "Tribes." The play, which begins performances on Jan. 31 and opens on Feb. 19 at the Lucille Lortel Theater, had a critically acclaimed production last winter at Signature Theater in Virginia. Starring opposite Ms. Mamet as her campus-crush-turned-antagonist will be Matt Lauria, who played a high school football star in the later seasons of "Friday Night Lights." The cast also includes Evan Jonigkeit (who starred opposite Kathleen Turner in "High" on Broadway) as Leigh's boyfriend, and Lauren Culpepper reprising her role from the Signature production as Leigh's roommate. The cast also includes David Hull, Kobi Libii and Aleque Reid. The MCC Theater production marks Mr. Colaizzo's New York playwriting debut.