Sam Waterston's upcoming appearance on SVU in Season 19 won't be the first time he appeared on the Law and Order spinoff. In fact, he played a part on no fewer than three episodes of SVU in its earlier days. That said, his latest appearance on SVU was back in Season 11, and a lot has happened since. Longtime members of the cast have departed. It should be interesting to see how Jack McCoy interacts with the newer members of the SVU squad. Fortunately, we don't have to wait too much longer to see for ourselves.