2. Tommy Chong - "Leo" (He was a guest star for all the other seasons he was in before the eighth season)
3. Lisa Robin Kelly - "Laurie Forman" (She has been a guest star at times and part of the regular cast at other times)
4. Jim Rash - "Fenton"
5. Allison Munn - "Caroline"
Those are my top five favorite guest stars. Who are your top five favorite guest stars?