20) Mark-Paul Gosselaar
Saved by the Bell marked Mark-Paul Gosselaar as the epitome of all the most iconic features of 90s teenage culture, Zack Morris. He has now donned a much harder, darker look from the bleach-blonde, clean-cut image that made him a heartthrob back in the day.
The young actor has stayed busy in front of the small screen, having had a stint in some shows such as NYPD Blue and Pitch, though his appearance has changed dramatically over the years.
Gosselaar's transformation isn't so much physically dramatic, as it is organic as he navigated his career from a teen heartthrob to a mature actor. Even though he might no longer look like the old Zack Morris of the 90s, his acting career has only moved upward with time.