The Real Housewives of Orange County 9 p.m., Bravo
Happy birthday to you, you live in a reality TV zoo, you look like giant-mongooses-with-fur-colors-not-found-in-nature-and-epic-fingernails-that-look-like-claws-and-giant-cheeks-that-make-your-heads-seem-too-big, and you act like them too. Here’s the two-hour 100th episode special, featuring interviews with cast members past and present, as well as a series of best-of clips.
Gosford Park 8 p.m., Sundance Channel
Oh sure, everyone is all into “Downton Abbey.” But show creator and writer Julian Fellowes started his whole British estate upstairs-downstairs storytelling with this 2001 Robert Altman movie, for which he won a screenplay Oscar. The stars include Helen Mirren, Emily Watson, Alan Bates, Jeremy Northam, and — what’s this? — Maggie Smith.
Gangsters: America’s Most Evil 10 p.m., Biography
Or, read the Globe.
Big Brother 9 p.m., CBS
The Power of Veto, by Huey Lewis and the Snooze.
Catfish: The TV Show 10 p.m., MTV
As opposed to the dinner.Matthew Gilbert can be reached at firstname.lastname@example.org. Follow him on Twitter @MatthewGilbert.