Eureka to Supernatural
3 connections
Eureka
Warehouse 13
Fargo from Eureka visits Warehouse 13 in a crossover episode
The X-Files
On Warehouse 13 Mrs. Frederic and Steve Jinks enter The Library, a secret room in the Vatican. There is a pack of Morley cigarettes on the table
Supernatural
Characters on Supernatural rented cars from the fictional Lariat Rent-A-Car which Mulder and Scully rented from on The X-Files