Happy 25th Anniversary, 'Law & Order'! Our 25 Favorite Before-They-Were-Stars 'L&O' Guest Stars

Dick Wolf’s Law & Order premiered 25 years ago on Sept. 13, and in addition to being one of the most addictive TV series ever, the New York City-set legal drama is a who’s who of many of great actors and actresses working today, from Emmy and Oscar winners to significant portions of the casts of series like The Walking Dead, Orange Is the New Black, The Wire, and The Sopranos.

In honor of the enduring legacy of the show, which still airs repeats daily on networks like WE tv, TNT, Sundance, and WGN, we flashback to 25 of our favorite L&O guest stars… and the naughty, naughty things they did in primetime.

Law & Order: The Complete Series is available on DVD.