Now, this is hard. because my dream all through season 3 was that she would stick around, and be on the good side. so it was REALLY a treat to see her on the good side of Buffy season 7 and Angel season 4...BUT I had to say BtVS season 3. She took over every scene she was in. ED did some amazing acting in that season. She was such an intense interesting character, and she was definately the reason that season 3 is probobly of the best of the entire show.