American Dad! (2005)

S8E10 Wheels & the Legman and the Case of Grandpa's Key

Stan becomes part of Roger and Steve’s imaginary detective agency, but his utter lack of skill quickly diminishes the excitement. Frustrated, Roger insists that Steve should fire Stan, but Steve struggles to go through with it and ends up deceiving Roger instead. The situation escalates when Stan gets kidnapped, forcing Steve to come clean to Roger about the whole mess.