Big Brother 27: Everything You Need to Know Before Premiere Week Kicks Off

Just a few days ago, Big Brother officially turned 25—marking a major milestone for the long-running reality TV phenomenon. As the show enters this landmark year, fans are expecting big twists, bold moves, and unforgettable gameplay. But for now, excitement is focused on one thing: the premiere of Big Brother 27, which is just days away.

As we count down to the season launch, CBS has dropped a flurry of announcements and sneak peeks.

So, in case you missed anything; here’s a full recap of all the key details you need to know before the houseguests move in.

Big Brother 27 Premieres This Thursday

CBS confirmed that Big Brother 27 will premiere on Thursday, July 10, with a 90-minute episode airing from 8:00 PM to 9:30 PM EST. In addition to the regular weekly episodes on Sundays, Wednesdays, and Thursdays, fans will also get a new treat this year: a bonus series titled Big Brother Unlocked, debuting Friday, July 25.

Cast Reveal Coming Tuesday

Fans got a cryptic clue over the weekend when the phrase “Crow Tearooms Travel” appeared on the official Big Brother Instagram page. It turns out this is an anagram for “cast reveal tomorrow,” confirming what many already suspected: the full cast will be revealed on Tuesday.

On Saturday, CBS unveiled a sneak peek of five new houseguests, leaving us eager to meet the remaining eleven—or possibly even twelve—contestants. Rumors also suggest that the houseguests are moving in that same day.

A Mystery Houseguest Joins the Game

One of the most talked-about twists this season is the introduction of a mystery houseguest. Host Julie Chen Moonves has teased that this person will be “polarizing,” suggesting it’s a real, controversial figure rather than a fictional character like past seasons’ Jankie or Ainsley.

Fan theories are swirling: Will the mystery guest be a celebrity, a reality TV veteran, or a returning Big Brother icon? Popular guesses include Rachel Reilly, Vanessa Rousso, Angela Murray, and Cameron Hardin. The buzz currently leans heavily toward Rachel Reilly making a surprise appearance—possibly not as a player, but as part of the twist reveal during Thursday’s premiere.

Live Feeds Begin Sunday, July 13

Although the season premieres on July 10, Live Feeds won’t go live until Sunday, July 13, following that night’s episode from 8:00 to 9:30 PM EST. This delay has sparked speculation—could a game-changing twist unfold in the first few days that producers want to keep under wraps? Or is it simply a scheduling choice? Either way, fans are eagerly waiting for the drama to start streaming.

The House Design Hints at Hidden Secrets

This year’s theme is mystery, and it’s reflected in every corner of the newly designed house. Big Brother 27 is being set up as the season of secrets, and the house itself seems to play a major role in unfolding the game’s twists. With hidden clues and mysterious décor, we’re expecting the house to reveal game-altering surprises as the season progresses.

With a 90-minute premiere, a mystery houseguest, delayed live feeds, and a twist-filled theme, Big Brother 27 is shaping up to be one of the most unpredictable seasons yet.

Whether you’re a longtime fan or tuning in for the first time, now’s the time to catch up, grab your snacks, and prepare to expect the unexpected—because the game is almost on.