Law & Order: LA to Melrose Place (2009)

Part of the Law & Order Universe

Law and Order and Homicide crossed over on four episodes

Homicide's John Munch questioned The X-Files' The Lone Gunmen.

Brenda Walsh picks up a Morley smoking habit while in Paris on Beverly Hills 90210

90210 was a continuation of Beverly Hills 90210 years later

Melrose Place (2009) was a continuation of Melrose Place which was a spin off of Beverly Hills 90210 that was continued as 90210