"Big Brother" is back this summer with Season 27, where the official theme will be "Big Brother: A Summer of Mystery." ...

Ahead of the "Big Brother" Season 27 premiere, CBS has unveiled the theme and first-look photos of the new house, Hotel ...

Julie Chen Moonves returns to host Big Brother Season 27, which premieres with a 90-minute episode on Thursday, July 10 at 8 ...

A first look at the 'Big Brother 27' house teases a mystery theme, a 'Mystery Houseguest' and twists that fans won’t see ...

Julie Chen Moonves teased 'Big Brother 27' twists, including a secret accomplice, a masked visitor and a 'polarizing' mystery ...

There will also be a mystery houseguest, along with a masked visitor and secret accomplice on the season premiere.

Chen Moonves tells Entertainment Weekly that she was shocked when told who the mystery houseguest was. And she goes on to say ...

I never expected that person. And I was very excited because, in my opinion, getting that person is epic,” the host said.

"Big Brother" is promising a summer of mystery when Season 27 premieres next week, as seen by CBS's new first-look images of ...