Dharma & Greg (1997)

S05E16 I Think, Therefore I Am in Trouble

Supermodel Claudia Schiffer makes a special appearance as Gretchen, an incredibly attractive new attorney at Greg's firm, who becomes the focus of his romantic daydreams. As Greg struggles with his feelings of guilt—particularly since he and Dharma are celebrating their four-and-a-half-year milestone—he attempts to banish thoughts of Gretchen from his mind, but finds it increasingly difficult to do so.