https://screenrant.com/law-and-order-cameos-guest-stars-famous-appeared/

In the criminal justice system, guest appearances on Law and Order are considered mandatory among Hollywood’s elite. These are their stories.

I can think of one they forgot. Adam Driver, who's now known all over as Kylo Ren (Han and Leia's son) in Star Wars. He guest starred in an episode of the original Law & Order.

Ed.

I thought about reading the article, but that quote was all it took to change my mind.