Over the course of its 15 seasons, produced some incredible cases, and some which didn't reach the same heights. The show follows the FBI's Behavioral Analysis Unit, or BAU, as they travel all over the United States profiling and capturing serial killers and other criminals. In many ways, is a fairly standard procedural drama, but the show's complex understanding of criminal pathology makes for a fascinating investigation into the psychology of crime.

went through a lot of cast changes over the years, so its only natural that the seasons should fluctuate in quality. Main characters would come and go relatively often, and the show is at its best when the team at the BAU has some time to gel. Aside from the issues with the cast, the show's quality is also impacted by the caliber of villains that show up each week, and the guest stars who play them.

There's a huge difference between the best and worst seasons of but when everything falls into place, it can produce some riveting cases.

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