Supernatural to Without a Trace
4 connections
Supernatural
The X-Files
Characters on Supernatural rented cars from the fictional Lariat Rent-A-Car which Mulder and Scully rented from on The X-Files
Homicide: Life On The Street
Homicide's John Munch questioned The X-Files' The Lone Gunmen.
Law & Order
Law and Order and Homicide crossed over on four episodes
Without a Trace
Multiple episodes feature Hudson University, the Alma Mater of multiple L&O characters