 Season three production was interrupted and delayed by the 2007–08 Writers Guild of America strike.Season four included the first crossover event with the Syfy series "Warehouse 13".Douglas Fargo (Neil Grayston) appeared in the August 3, 2010 episode of "Warehouse 13", while Claudia Donovan (Allison Scagliotti) of "Warehouse 13" appeared on "Eureka" on August 6, 2010.