Season 27 of "Big Brother" premieres Thursday. Meet this year's houseguest and see how to watch the CBS original series.

Big Brother fans are buzzing about the show’s latest twist, and they think they’ve got it uncovered. During the Season 27 premiere on July 10, the mystery 17th houseguest, Big Brother legend Rachel Reilly, was revealed. But that wasn’t the only surprise in store for fans for this season's "Summer of Mystery."

The popular reality TV competition series, “Big Brother,” returns Thursday, July 10 at 8 p.m. ET on CBS. Stream the season 27 premiere with Fubo, DirecTV, and Paramount+ (free trials available).

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.

Here's what to know about Season 27. What is the theme for this season? The official theme will be "Big Brother: A Summer of Mystery," CBS confirmed this month, according to USA T

The premiere of Big Brother Season 27 is just days away, but that's not soon enough for some. The house and theme were revealed, as well as the existence of a mystery 17th Houseguest. CBS decided to tease fans just a bit more by dropping a five-second promo featuring five of the new contestants.

Julie Chen Moonves returns to host Big Brother Season 27, which premieres with a 90-minute episode on Thursday, July 10 at 8 p.m. ET on CBS. A second 90-minute episode will follow on Sunday, July 13 at 8 p.m. ET. RELATED: ‘Survivor 50’ Cast Photos: All The Castaways Confirmed For CBS Competition

Big Brother host Julie Chen Moonves had some time to kill during the show's season 27 premiere on Thursday, July 10. The action-packed opener kicked off on a shocking note with the introduction of a mysterious new character called "The Mastermind,

Season 27 of Big Brother premiered last night, and though we're only in the early stages of the season, it's clear that Hotel Mystère is going to be packed with mystery and intrigue. The episode began with this season's houseguests further introducing themselves,

For longtime viewers, seeing a new face during weekly live evictions would feel like the end of an era. Across 20-plus years, Julie has become part of the Big Brother experience, sharing fans' passion for the game. As a fellow fan, she asks tough, pointed questions, especially when addressing the show’s most controversial exits.

Big Brother host Julie Chen Moonves had some time to kill during the show’s season 27 premiere on Thursday, July 10. The action-packed opener kicked off on a shocking note with the introduction of a mysterious new character called “The Mastermind,

"Big Brother" Season 27 contestants better grab a life vest, because star Rachel Reilly is checking in as the 17th houseguest