After studying reruns of "The Brady Bunch" extensively, I have determined during which season each Brady family member was groovy or gross. I have based my findings on appearance and/or attitude. In order to put a possitive spin on this study, I have given each family member two seasons to be groovy and one season to be gross.
Note: Alice and Sam are not included because they did not change that much over the seasons. Oliver is included in season five.

Season One:
Groovy: Mike (Mr. Clean Cut)
Carol (the wig was kind of cute)
Peter (all American boy)
Jan (very cute)
Bobby (cute)
Cindy (adorable)
Gross: Marcia (wound up as tight as her pony tails)

Season Two:
Groovy:Mike (see season one)
Peter (see season one)
Bobby (see season one)
Gross: Greg (a little too nerdy)

Season Three:
Groovy: nobody
Gross:Cindy (trying too hard to be cute)

Season Four:
Groovy: Greg (very confident)
Marcia (a living Barbie Doll)
Gross:Carol (the shag was getting a little old)
Peter (too much hair for one skinny kid)
Jan (very uptight)

Season Five:
Groovy:Carol (she looked really pretty)
Greg (see season four)
Marcia (see season four)
Jan (WOW!!!)
Cindy (especially after she ditched the braids)
Oliver (he was kind of cute)
Gross:Mike (perm and plaid, plus he didn't go to Greg's graduation and went on a business trip instead)
Bobby (puberty was beginning to hit)
Oliver (Jinx!!!)