Shannen Doherty did a guest appearance on Riverdale to help pay respect to her good friend Luke Perry. Luke starred on the show until he passed away unexpectedly this past March. So when the show asked Shannen to do a guest appearance for the season premiere, which paid tribute to Luke Perry and addressed the character's passing, she happily agreed. Shannen and Luke stayed friends long after 90210 was over. I don't even watch the show but loved this episode so much.
Brenda and Dylan forever...
