What's on TV Tonight: September 29

How to Be a Gentleman 7:30-8pm, CBS. A columnis that specializes in gentlemanly manners ends up relying on the knowledge of his former high school bully in order to adapt to his magazine's new direction.

Parks and Recreation 7:30-8pm, NBC. When Ron's first ex-wife begins manipulating him, Leslie turns to the other important women in his life to draw him back out.

Person of Interest 8-9pm, CBS. The machine's reliability seems questionable when it sets Reese and Finch on an investigation of a teenager killed several years ago.

It's Always Sunny in Philadelphia 9-9:30pm, FX. When Frank accidentially ends up the host of children's beauty pageant, the gang must help him get through the event without suspicion.

Archer 9:30-10pm, FX. Archer and his fellow cellmates plan their escape while Malory attempt to haggle on the ransom of her son.