Big Brother 27 Premiere July 10: Mystery Guest Sparks Viewer Shock
By M Muzamil Shami - July 3, 2025
Key Points
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Premiere date: Thursday, July 10, 90-minute episode (8–9:30 p.m. ET)
Expanded schedule: Episodes air Sundays, Wednesdays (90 min), Thursdays; plus Big Brother: Unlocked every other Friday
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Live feeds begin July 14 at 12:30 a.m. ET on Paramount+ and Pluto TV
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Mystery houseguest teased by Julie Chen Moonves as “polarizing” with explosive impact
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Hotel Mystère theme brings elegant old‑world aesthetic, bunk beds, and immersive “detective” gameplay
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Host Julie Chen Moonves returns; fresh full‑cast, yet hints at unexpected twists
Big Brother 27 Kicks Off with Mystery Guest & Expanded Episodes
Reality TV fans, brace yourselves: Big Brother 27 is set to return with a twist-laden launch and a jaw-dropping mystery guest designed to ignite controversy—and conversation.
Premiere & Episode Schedule
The season kicks off with a special 90‑minute premiere on Thursday, July 10 (8–9:30 p.m. ET). It doesn’t stop there—episodes will also air every Sunday and Wednesday (each 90 minutes), and Thursday (60 minutes). Viewers craving more behind‑the‑scenes content can tune in to Big Brother: Unlocked, a bi-weekly after-show premiering Friday, July 25 (8–9 p.m. ET), spotlighting All‑Star analysis, bonus footage, surprise guests, and candid expert commentary.
Live Feeds Begin
As exclusive content lovers have come to expect, livestream feeds from the house launch at 12:30 a.m. ET on July 14, available on both Paramount+ and Pluto TV, letting fans follow the drama in real time.
The “Hotel Mystère” Theme
This season’s thematic centerpiece is the Hotel Mystère–designed house, complete with vintage-style bunk beds and an evocative ambiance resembling a 1920s luxury train or Alpine hotel. According to host Julie Chen Moonves, the house is full of dual-meaning decor, hidden clues, and intentional misdirection—a “detective game” where viewers and contestants alike must question appearances and interpret subtleties.
Masked Visitor, Secret Accomplice & Mystery Houseguest
Julie Chen Moonves confirmed the premiere includes three explosive game-changers:
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Masked Visitor – A disruptive force more impactful than Ainsley last year, threatening to shake up alliances and strategy.
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Secret Accomplice – An insider inside the game, working with hidden objectives that may tilt power structures.
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Mystery Houseguest – A hugely polarizing figure, so surprising that even Julie admits she “never expected that person.” Expect major public reaction and social media uproar the moment they enter.
Host Julie Chen Moonves Returns
Veteran host Julie Chen Moonves is back at the helm, guiding the audience through each twist and turn. She confirmed the cast is "all-new," but the presence of a mystery guest hints at returning reality TV veterans—or even outside-the-box entrants like reality-to-politics crossovers (think Scaramucci)—adding unpredictable energy.
Season Context & Contest Legacy
Last season ended with Chelsie Baham winning unanimously 7–0 against Makensy Manbeck, and this new season marks the franchise’s 27th fresh contest. Don’t forget, a Celebrity Big Brother series may return during the winter months, expanding the BB universe further.
FAQs
Q1. When does Big Brother Season 27 begin?
A: The premiere airs Thursday, July 10, 8–9:30 p.m. ET on CBS, with hourly follow-ups on Wednesday, Sunday, and Thursday.
Q2. Who is the “mystery houseguest”?
A: Details are under wraps, but host Julie Chen Moonves calls them “very polarizing.” It could be a reality legend or unexpected public figure.
Q3. When can fans watch live feeds?
A: Live streams begin 12:30 a.m. ET on Sunday, July 14 via Paramount+ and Pluto TV.
Q4. What is Big Brother: Unlocked?
A: A two-hour hosted after-show airing every other Friday from July 25, featuring unseen footage, guest interviews, and expert breakdowns.
Power Angles: Shock, Mystery, Urgency
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Shock & Surprise: Mystery houseguest teased as “polarizing”—audience tastes clash.
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Mystery & Intrigue: Decor and gameplay hold hidden meanings; viewers become detectives.
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Urgency & Excitement: Premiere is this week—don’t miss the explosive first installment.
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Celebrity+Talent Hook: Julie Chen Moonves returns to guide amid twists and secret guests.
Sound off in the comments: Who do you want or expect the mystery houseguest to be? A reality legend, A-list celebrity, or unexpected wild card? Subscribe now for live-feeds alerts and behind-the-scenes coverage—don’t miss a moment!
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