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This episode marks the first appearance of Phoebe's (Lisa Kudrow) twin sister, Ursula (also played by Kudrow), who is the exact opposite of the considerate and peace-loving Phoebe. Joey starts to date Ursula, which annoys Phoebe because she doesn't get along with her sister. Meanwhile, Ross (David Schwimmer) attends Lamaze class with Susan (Jessica Hecht) and Carol (Jane Sibbett). As Carol voices her anxiety about going through with the pregnancy, Ross also begins to come to terms with his role as a father; much humor is made over who gets to play the father role in the class exercises. Across town, Chandler (Matthew Perry) is dating Nina (Jennifer Grant), an employee he cannot bring himself to fire -- instead, he tells the other office workers that she is insane and too imbalanced to let go. When Nina asks why her co-workers are avoiding her, Chandler says that perhaps they are jealous of their relationship. After Marcel, Ross' monkey, changes Monica's (Courteney Cox) TV to Spanish mode, the gang sits around and watches it. This leads Joey to make the astute observation that "Urkel" is spelled the same way in Spanish as it is in English. Helen Hunt and Leila Kenzle show up at Central Perk as Jamie and Fran, their characters from Mad About You. This episode is part one of a two-part episode that originally aired on February 23, 1995.