For an up-and-coming actor, an appearance on a "Law & Order" episode is a rite of passage. Since 1990, more than a few of the attorneys, victims, perpetrators, witnesses, kids, suspects and police of the week have gone on to become some of the biggest television and movie stars in the world. With over 1,200 episodes from the "Law & Order" library to date and tens of thousands of roles for actors, it's no surprise that many of them have gone on to incredible careers. This insightful look back is a celebration of 30 years of a legendary franchise and the stars who have helped pave the way.