Jenna's mother comes to visit, and she looks to Jack to help. Frank moves in with Liz as a boarder, and they decide to aid one another stop some bad habits.
Liz Lemon meets her mother's old flame, while Jack Donaghy's mother, Colleen, gets tangled in his relationships with Avery Jessup and high school love, Nancy Donovan. Jenna's mother, Verna returns, while Tracy learns a lesson from his "mom".