The gang meets Molly, the new hot nanny, and Joey becomes instantly infatuated.

Mike finds a rat in Phoebe's apartment and insists she get rid of it.

Rachel tries to apologize to Gavin but they end up arguing about his behavior.

Ross and Chandler ask Joey not to pursue Molly, which only makes him want her more.

Mike sets traps and accidentally kills Bob, who turns out to be a mother rat.

Ross asks Chandler to keep Joey away from Molly, but Chandler is skeptical.

Joey tries to see Molly but Chandler blocks him, making Joey more determined.

Gavin pretends Rachel is his secretary on a call, escalating their office war.

Monica meets Gavin and Rachel reluctantly invites him to her birthday party.

Monica suggests Gavin likes Rachel, but Rachel dismisses the idea.

Phoebe brings Bob's orphaned rat babies to Rachel's birthday party.

Ross and Chandler find Joey alone with Molly and confront him.

Molly's girlfriend Tabitha arrives, ending Joey's romantic hopes.

Phoebe and Mike argue about the rat babies and their future.

Rachel's party ends early, and Gavin shows up late with a gift.

Gavin gives Rachel a scarf and kisses her, which she returns.

Ross watches from his apartment as Rachel kisses Gavin, breaking his heart.

Mike returns to Monica's apartment looking for a lost rat baby.