I read this summary of a Criminal Minds/Big Bang Theory crossover: "Gideon recruited a different genius to the BAU, and nobody is particularly happy about it." I don't know BBT, but there are so many interesting geniuses that could have been (possibly minus that last part). Personally, I favor Shawn Spencer (who could be interesting in the changes to him from working that kind of case, as well as differences from canon--AU, or preseries with a later 'BAU comes to Santa Barbara' plot). But, since I haven't watched Criminal Minds...*shrugs*