“Beer For My Horses” (7 p.m., CMT): Toby Keith stars in this caper about two buddies

“Beer For My Horses” (7 p.m., CMT): Toby Keith stars in this caper about two buddies outrunning the law to save a damsel in distress.

“The Simpsons: Treehouse of Horror” (8 p.m., Fox): By Sunday, Halloween may be a distant memory, but there’s one last step in the holiday ritual. You must finish off the remnants of the candy corn and Gummi Worms you were foisting on costumed youngsters two days earlier as you treat yourself to “The Simpsons,” airing its 19th annual “Treehouse of Horror.”

“Brotherhood” (8 p.m., Showtime): Just in time for Election Day, “Brotherhood” returns with its infectiously bleak message: Politics is an inherently corrupt business, even for its most idealistic participants. And the show offers an accompanying notion: Outlaws routinely wield power comparable to that of elected officeholders.

Back for its third season on Showtime, this splendid drama focuses on a working-class Irish-American family in Providence, R.I., where “good” brother Tommy Caffee (played by Jason Clarke) started out as an ambitious but idealistic state legislator. “Bad” brother, Michael, a small-time mobster, continues to stake his claim with a fiercer approach — and continues to cause trouble for Tommy, who is scrambling to preserve his clean-cut image as a public servant and family man.

By now, Tommy is having difficulty keeping that identity intact — especially in his own mind.

“I’m a hack,” he tells his wife mournfully in the season premiere, as he pledges to make a new start with her far away from Providence, before it’s too late.

Michael has his own problems, including a mortal enemy being released from jail who must be dealt with before it’s too late. His hair-trigger temper hasn’t been helped by the brain injuries he suffered in a beating at the end of the first season, and on this episode he erupts with a display that will put him at even greater risk.

But “Brotherhood” isn’t just a show about crime. Its array of vivid characters have ordinary, relatable concerns that are seldom addressed so well in any other drama — like the challenge of stretching a dollar.