S4, E12: Liz Lemon (Tina Fey) takes Frank (Judah Friedlander) in as a roommate, and is pleasantly surprised when the two make a pact to help each other kick their bad habits. Meanwhile, Jenna Maroney (Jane Krakowski) turns to Jack Donaghy (Alec Baldwin) for help with her mother, Verna (Jan Hooks), who has come to visit. Also starring: Tracy Morgan (Tracy), Jack McBrayer (Kenneth), Scott Adsit (Pete), Keith Powell (Toofer), John Lutz (Lutz), Katrina Bowden (Cerie), Kevin Brown (Dotcom), Grizz Chapman (Grizz), Sue Galloway (Sue).