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Big Brother Season 27 Premieres Tonight With ‘A Summer of Mystery’ Theme

Tonight’s 90-minute Hotel Mystère premiere sends contestants into a puzzle-laden house with clues pointing to a hidden seventeenth houseguest

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Zach Cornell, Houseguest on Season 27 of the CBS Original Series BIG BROTHER, scheduled to air on the CBS Television Network. -- Photo: Sara Mally ©2025 CBS Broadcasting, Inc. All Rights Reserved.
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Overview

  • Julie Chen Moonves returns to host the season opener at 8 p.m. ET/PT on CBS.
  • Houseguests will explore Hotel Mystère’s hidden passageways, poison bar and wineless wine cellar.
  • Viewers will encounter staged surprises including a masked visitor, a secret accomplice and the eventual entry of an unannounced Mystery Houseguest.
  • The 16 revealed contestants represent diverse backgrounds—from a professional bull rider and aura painter to an AI consultant and dungeon master.
  • Live feeds begin July 13 on Paramount+ and Pluto TV, with regular episodes airing Sundays, Wednesdays and Thursdays throughout the summer.