Watch Numb3rs Season 6 Episode 12. The team searches for a lost shipment of high-caliber firearms when one of the weapons is responsible for random killings throughout the city. Also, Charlie and Amita disagree on a wedding date while Don re-evaluates his relationship with Robin, on NUMB3RS, Friday, Jan. 15 (10:00-11:00 PM, ET/PT), on the CBS Television Network. Guest stars include James Remar as weapons dealer Randall Priest and Jon Seda as arms broker Lonnie Moses. John Cariani reprises his role as Professor Otto “Otto-Bahn” Bahnoff.