NEW YORK (September 23, 2009)--A dozen past and present stars of "Law & Order" have gathered to mark the start of its 20th year at an event Wednesday in the familiar courtroom set of the NBC series, which now ties "Gunsmoke" as TV's longest-running drama.

Former regulars including Benjamin Bratt, Angie Harmon and Jill Hennessy joined Sam Waterston, Anthony Anderson and fellow members of the current ensemble.

The series debuted in September 1990 and has not only persevered, but has also spawned two successful spinoffs.

"Law & Order" creator Dick Wolf said he hopes the show will be back again next fall, when it can make sole claim to the endurance record.

"I hope we'll see you here in 2013,” he said.

The season premiere is at 7 p.m. Friday.