The One with the Sonogram at the End
Ross's lesbian ex-wife, Carol, is pregnant with his child, and he doesn't like her choice of last name for the baby. Rachel finds out that her ex-fiancé went on what would have been their honeymoon with her maid of honor.
Pilot
An introduction to the gang. After Rachel leaves her fiancé at the altar, she moves in with Monica and finds that independence is not so easy, particularly without Daddy's credit cards.