That's supposed to be a takeoff on "The Changing of the Guard", haha. ;)

So the show was filmed during the girls' adolescence. Who do you think made the biggest change in growing and maturing during seasons of the show?

My top 2 are Molly Ringwald and Nancy McKeon.

Molly really changed a lot from the end of season 1 to the beginning of season 2, growing and maturing so much, and her voice lowering to her more adult range.

As for Nancy, she changed so much from the end of season 2 to the beginning of season 3. She grew a lot, and her eyes looked to open up more, she just looked so much older and more mature. Also, surely other fans have noticed that her voice sounded "breathy" in season 2, a vocal quality that interestingly enough none of the other actresses had. But by season 3, that was gone, and her voice was more "solid" and into her adult range, with all the breathiness gone from it.

So in your eyes, who made the most drastic changes in maturity/change between seasons?

Probably Molly. She looked totally different without that bowl cut, and with her hair color changed. All the others are recognizable as themselves.