It feels like ages, but Criminal Minds finally returns with a new episode this Wednesday night - and it will focus on the return of an iconic serial killer.

Or the suspected return of him, I should say.

On "True Genius," the BAU will travel to San Francisco under suspicion that the Zodiak Killer - yes, that Zodiak Killer - is once again on a murderous warpath. Meanwhile, Reid will ponder his own capabilities as he accompanies Prentiss to a seminar on violent crime hosted by the crime novelist Patricia Cornwell. Watch the CBS episode promo now:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.