Frank re-lives his 20s and joins the workforce for the first time! Meanwhile, Fiona grapples with evicting someone from her building; Lip works out a plan to sabotage Charlie's chances with Sierra; Ian and Carl make a troubling discovery about Monica; and Kev says his goodbyes as he prepares to go under the knife.

A blast from the past shakes up Fiona's view of her life. Meanwhile, Frank gets involved with Liam's school and becomes the most popular dad in the PTA; Lip learns getting laid is harder than anticipated when sober; Ian crosses a boundary with a kid from the youth center; and Kev and V take a trip to meet his birth family.