Big Brother 8 p.m. CBS
If you think “Big Brother” has grown repetitive after 15 straight seasons, you’re right. But just for kicks, get thyself to YouTube and watch the first season of this pillar of reality TV. You’ll see that quite a bit has changed. The formless voyeuristic blob that was the first season had no power structure to keep the guests fighting and fibbing, very little dramatic editing to construct characters, and lots of chickens — raised by the houseguests for “protein.” It’s also kind of fun to watch those first cracks wiggle their way through our contemporary facade of privacy. Back in 2013, Spencer and Howard (above, with Candice) are totally on the block and everyone’s totally freaking out about the MVP twist and tonight’s Veto. So yeah, same slop different day.