Big Brother' is off and running in season 27 on CBS, with double-digit percent growth in total viewers from the year-ago season opener.

Big Brother 27,' hosted by Julie Chen Moonves, premieres on Thursday,. See which houseguests are in power as HoH, who is nominated and who has been evicted so far

Big Brother returned for its 27th season on July 10, 2025, kicking off a new summer of strategy, alliances, twists, and drama.

Big Brother follows a group of people living together in a house outfitted with more than 100 cameras and 100 microphones, recording their every move 24 hours a day. Each week, someone will be voted out of the house, with the last remaining Houseguest receiving the grand prize of $750,000.

Everything you need to know about ‘Big Brother’ season 27, including how to watch, where to stream the live feeds, and the cast.

Rachel Reilly is back in the Big Brother house, and fans are either cheering or ready to change the channel. The Season 13 champ made a surprise entrance on the July 10 premiere of Big Brother 27 as the long-rumored “mystery houseguest,” after CBS teased her return with a week of cryptic clues.

Sleeper car bunk room: Behind a secret entrance, this train-themed bedroom straight out of a murder mystery novel contains bunkbeds for six Houseguests (the first time the BB house has had bunk beds since season one!) and a sleek Art Deco design.

"That's a world I don't even want to imagine," Chen Moonves responds when asked about a 'Big Brother' future without her