What better way to kick off Prentiss' interminable Irish storyline than an episode about alcoholic spree killers? "The Thirteenth Step" is widely considered one of the series' worst...by fans of Criminal Minds, so that translates to it not being that bad. Ray Donovan (not Liev Schreiber) and the girl from the Wonder Woman pilot are killing convenience store denizens and child molesters across the Midwest, and it's up to a team of no blondes to stop it. As is custom, there's also a lot of off topic talk, like why Garcia is the Slimer of Criminal Minds and the one surefire way to get Ronnie back to drinking.
