Mariska Hargitay has more than 500 episodes to choose from when it comes to picking her favorite of the Law & Order: Special Victims Unit series. The show has become the longest-running and most successful Law & Order spin off and Mariska Hargitay has been there since the beginning. While the original Dick Wolf drama Law & Order focuses on major crimes, which usually means murder mysteries, SVU takes on crimes that include a sexual component. While the series often has very dark subject matter, the commitment of the actors and the storytelling keep fans coming back for more.