Considering that Warehouse 13 and Eureka is about to have crossover episodes, I'm left wondering if this has happened before. How many times have a show had a crossover with another?
Biggest crossover I'm aware of is... Green Acres- The Beverly Hillbillies- Petticoat Junction. They crossovered and referenced each other on a semi-regular basis.
Considering that Warehouse 13 and Eureka is about to have crossover episodes, I'm left wondering if this has happened before.? How many times have a show had a crossover with another?
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It is quite common.
Last year, CSI did one.
Lots of shows do it.
TV shows constantly do references to other shows for lots of reasons. It could just be a small shout-out, such as actors from another show guest-starring to promote that other show. Or, if that other show is already over, it's just a bit of an in-joke with the audience who are fans of that other show. It could also be a full-blown crossover where two or more shows present a story arc that starts in one show and end in another. TV networks do that kind of stuff with their dramas and sitcoms to promote viewership. They also do that kind of stuff to test the viability of spin-off shows (e.g. NCIS, NCIS: Los Angeles, CSI: Miami, CSI: New York, Highlander: Raven).
i seem to remember that Law and Order crossed over with Homicide life on the streets ending up with John Munch(Belzer) eventually crossing from Homicide life on the streets to Law and Order: SVU
That jogged my memory of a 'serial crossover event' in which Sabrina the Teenage Witch crossed with Boy Meets World, Teen Angel, and You Wish. It was during the 1997-98 line up.