6x14 - American Dad!

After Roger and Francine are victims of a mugging, Roger joins the police academy so he can learn how to defend himself and his loved ones (including Stan and Steve), but he falls in with a corrupt cop (guest voice Cannavale) who leads him astray. Meanwhile, Hayley's new friendship threatens her long-term relationship. Chaz kidnaps and leaves Stan tied up and tape-gagged. Meanwhile, Roger kills Chaz and rescues Stan, who makes his boss happy.