Big Brother 27: Who Is the Mystery Houseguest?

Julie Chen Moonves
Photo Credit: Monty Brinton/CBS via Getty Images

The theme for Big Brother 27 is a “summer of mystery.” On Thursday, June 10, sixteen houseguests will enter “Hotel Mystère,” equipped with hidden passageways and train-themed sleeper car bunk beds. The new batch of players will soon be greeted by a 17th mystery houseguest whose identity is yet to be revealed. We don’t know for certain who the unknown player is, but of course, we have some ideas. 

Let’s get into it.

How does the Mystery Houseguest work on Big Brother?

The cast list for BB27 was released on Tuesday, July 8. While fans were reading through cast bios, they noticed something peculiar at the bottom of the list. There was a mystery player mentioned. We don’t know much about how the twist works, but knowing Big Brother, the mystery houseguest will have a major impact on the game.

In the BB26 premiere, the houseguests had a choice whether to allow an extra houseguest named “AINSLEY” enter the game. Well, it turns out, the choice was a test. “AINSLEY,” which stands for “Artificial Intelligence Network Self Learning Entity,” was an introduction to the season’s theme, BBAI. The players that did not vote for AINSLEY to stay were punished, blocking them from competing in a crucial competition.

We saw a similar twist on Season 3 of The Traitors. In Episode 1, the players chose not to sacrifice one of their own in order to allow Survivor legend Boston Rob to enter the game. The decision came back to haunt them when he entered the game later on as a Traitor.

The mystery houseguest could potentially be similar. Perhaps the houseguests will be able to decide whether they want to add a 17th player. Maybe the mystery player will begin their game in the shadows, making game decisions in secret for the first week. The live feeds will not be available until Sunday, July 13, which is pretty unusual for for Big Brother. The delay may be an attempt to conceal with mystery houseguest’s identity.

Julie Chen Moonves shared some insider details about the twist in an interview with Entertainment Weekly, saying the mystery houseguest will have a lot of power.

“The accomplice this person’s going to have – they’re going to have responsibilities, and they may or may not be able to pull it off, and that will affect the game,” she said. “And the masked visitor – very disruptive, and on another level that is more far-reaching than Ainsley last year.”

Big Brother 27 Mystery Houseguest theories

Big Brother fans are not known for being chill, so naturally, fan theories have flooded the internet since the cast list dropped. There seem to be a few names floating around. Big Brother 13 winner Rachel Reilly is the number one suspect. BB alum Janelle Pierzina added fuel to the rumor when she tweeted about Rachel being MIA.

“Dude, I’ve called Rachel [Reilly’s] phone 10 times to chat about our next BB Cruise and it goes right to voicemail,” she wrote. “Did she seriously not tell me that she’s going back into the Big Brother house?!??! That woman tells me everything!!”

Interesting…

Some fans suspect BB26 star Angela Murray may be the unknown player. One fan noticed Angela’s last completed Cameo was a couple of days ago. They tweeted, “Angela’s last completed cameo was [on] Monday, is it possible she is in sequester and is the mystery houseguest? #BB27.”

The Angela theory also aligns with something Julie said in a recent interview with EW.

She told the outlet, “I never expected that person. I was very excited because, in my opinion, getting that person is epic. And that person is also very polarizing. So, there’s going to be a strong reaction in both directions for this mystery houseguest.”

There is no doubt Angela was a polarizing figure on her season. Some people loved her crash outs and over-dramatic speeches, others couldn’t stand the drama. BB also loves to bring back a returning player from a recent season. They cast Paul Abrahamian and Rachel Reilly in back to back seasons.

In addition to the main contenders, there are a few other names circling the community, including B17 mastermind Vanessa Rousso, BB6 star James Rhine, and BB22 winner Cody Calafiore. There is also the possibility that the mystery houseguest is from a different competition show. We recently saw Survivor legend Cirie Fields compete on Big Brother, so it’s possible the mystery houseguest may not be a Big Brother alum. We’ll have to wait and see…

Big Brother is available to stream on Paramount+.

TELL US – DO YOU AGREE WITH OUR THEORIES? WHO YOU DO WANT THE MYSTERY HOUSEGUEST TO BE?

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