At Monica’s Halloween party, Phoebe meets the friendly fiancé, Eric (special guest star SEAN PENN – “Dead Man Walking”), of her flighty twin, Ursula. Phoebe becomes alarmed when she learns that her sister has misrepresented herself to the trusting guy–and Phoebe finds herself attracted to him as well. Monica comes disguised as Catwoman and wonders if she could defeat Phoebe’s Supergirl character. Chandler arrives as a pink bunny and mistakes Ross’ giant “Spudnik” costume for something found on a sidewalk. Also, Rachel gives away all the candy and guiltily resorts to writing checks for the trick-or-treaters.