When the girl Peter's in love with falls for his older brother, Greg and the girls plan a farce to convince her that Greg's no good. It works, but in the end there's no need for it: Peter finally gets the nerve to express his feelings, and gets the girl.
One of the best episodes of season 4...in fact, one of the best episodes of the series in my opinion. This is a rare instance in which Peter seems to suffer the pains of being in his older brother's shadow, and Christopher Knight pulls it off so wonderfully. The scene in which Greg tries to convince Kerry he's a jerk is classic, especially when Marcia enters disguised as a jilted lover in sunglasses and a wig. And the ending where Peter finally gets the girl? So adorable. The episode's tag line is pretty amusing too!