Clay Aiken will perform his new song “This is the Night” on the 83rd annual Miss America pageant (8 p.m. today, ABC) live from Atlantic City, N.J. Tom Bergeron, host of “America’s Funniest Home Videos,” will preside over the beauty contest. This year’s pageant will introduce a new “casual wear” competition. Why? This is a beauty pageant, not an ad for The Gap.

Winners will also be announced in the categories of talent, lifestyle and fitness. “The Bachelorette,” Trista Rehn, and her poetic fiance, Ryan Sutter, also will preside over an offsite “viewing party” with their friends, as they try to guess which beauty will totter away with the crown.

Tonight’s other highlights

• An ordinary man (Christopher Eccleston) claims he is the son of God in the provocative 2003 British drama “The Second Coming” (7 p.m., BBC America).
• Basic cable makeover madness on “Date Patrol” (9 p.m., TLC).
• “Dogs of Peace” (9 p.m., Animal Planet) celebrates canines trained to sniff out landmines in Afghanistan. Heather Mills McCartney narrates.

Sunday’s other highlights

• Scheduled on “60 Minutes” (6 p.m., CBS): married priests; charges against a terrorist’s lawyer; Halliburton’s many ties to the Pentagon.
• Federal agents try to thwart terrorists before they strike on the repeat of the series premiere of “Threat Matrix” (7 p.m., ABC).
• Tom Cruise stars in the 2000 sequel “Mission: Impossible 2” (7:30 p.m., CBS).