Friends - Season 9 Episode 11 The One Where Rachel Goes Back to Work I'll be there for you.
Overview: Chandler starts looking for a job and is anxious about having a baby with Monica while uncertain about his career prospects. Meanwhile, Rachel visits work and finds out that during her leave, a guy named Gavin has been temporarily assigned to take care of her job. She starts to feel insecure about her job position and decides to come back from her leave early. Also, Phoebe works as an extra on Joey's TV show and brings even more drama to the set.