Summer doldrums always have inspired programming experiments. Some figure that, because nobody’s watching anyway, let’s try something really different. Others simply go for the lowest common denominator. Both schools of thought are on display tonight.

NBC airs two hours of “Saturday Night’s Main Event” (7 p.m., NBC), featuring WWE talent including John Cena and other athlete/entertainers.

CBS will rebroadcast the debut episode of Showtime’s “Brotherhood” (9 p.m., CBS). Both CBS and Showtime are owned by Viacom. Set in a crumbling Irish neighborhood in Providence, R.I., “Brotherhood” stars Jason Isaacs as a hard-nosed local legislator whose life is complicated by the return of his brother (Jason Clarke), a professional killer.

A handsome production filled with fine performances, “Brotherhood” is a curiously humorless affair that assiduously avoids references to contemporary mores and culture. It carries the air of prestige about it, but also the burden of self-importance.

Today’s highlights

¢ “CNN Presents” (6 p.m., CNN) looks at the 1996 crash of TWA Flight 800 and reveals how it could happen again.

¢ Bruce Willis and Samuel L. Jackson star in the 2000 supernatural thriller “Unbreakable” (7 p.m., ABC).

¢ Ample women compete in a beauty contest on “Mo’Nique’s Fat Chance” (7 p.m., Oxygen).

¢ Scheduled on “48 Hours Mystery” (8 p.m., CBS): After a teenager serves 15 years for the murder of his parents, another suspect emerges.

¢ Viewers help create a new flavor of ice cream on “Scoops” (8 p.m., Food).

¢ Michael York guest stars on “Law & Order: Criminal Intent” (9 p.m., NBC).

Sunday’s highlights

¢ Scheduled on “60 Minutes” (6 p.m., CBS): coercive employees and workplace freedom; orphaned brothers reunited with a buried past; Bode Miller.

¢ Scheduled on “Dateline” (6 p.m., NBC): the case of a 911 dispatcher whose husband and boyfriend perished under similarly mysterious circumstances.

¢ The single mother of a kidnapped child has a happy surprise on “Extreme Makeover” (7 p.m., ABC).

¢ A murder scene touched by voodoo on “Law & Order: Criminal Intent” (8 p.m., NBC).

¢ Dave Chappelle riffs on Howard Dean, Gary Coleman and pixies on “Chappelle’s Show” (8 p.m., Comedy Central).