Big Brother 8 p.m., CBS
Every summer, this reality TV series hits CBS like a case of scabies. This is the 15th season of houseguests living on a compound and acting like porn stars, with Julie Chen as their Hugh Hefner. It’s on the air three nights a week – Sunday, Tuesday, and Wednesday – but you know that’s not enough. So you can also pay for a subscription for the 24/7 live feed on CBS.com.
The Lookout 10 p.m., ABC
Here’s a show that Sen. Elizabeth Warren could love. The idea is to protect consumers from getting scammed and to help them get maximum value for their money. Expect to find reporters chasing down rich business owners, exposing mold-removal racquets, and raiding hotels to look for bed bugs. Full story for BostonGlobe.com subscribers.