CBS is loading up its summer schedule with a fresh season of Big Brother, returning Thursday, July 10, 2025, at 8:00 PM ET/PT with a 90-minute premiere. Season 27 adopts the theme Big Brother: A Summer of Mystery, dropping a new set of houseguests into the show’s most elaborate setting to date.
The house has been converted into the “Hotel Mystère,” a shadowy art deco retreat stuffed with oddities, secrets and misleading clues. Houseguests will enter through a Reception Area featuring 75 locked key boxes. Hidden within the house are twisted spaces like an attic of haunted artifacts, a wine cellar for hushed alliances, and even a murder-mystery-themed sleeper car bunk room.
The show will introduce a masked visitor, a covert accomplice, and a “Mystery Houseguest” whose identity will remain concealed for an unspecified stretch of time. Sunday’s follow-up episode on July 13 will also run 90 minutes, continuing the twist-heavy launch.
Host Julie Chen Moonves returns to steer the action, as Big Brother celebrates 25 years since its CBS debut in 2000. Regular Wednesday episodes have been extended to 90 minutes to pack in the growing layers of gameplay and strategy.
Beyond the broadcast schedule, fans can dive deeper with Big Brother: Unlocked, airing every second Friday starting July 25. The digital add-on delivers behind-the-scenes content and exclusive footage. Live Feeds launch at 9:30 PM PT on Sunday, July 13 via Paramount+ and Pluto TV, giving superfans unfiltered access inside the house.
Other standout house areas include the Venom Lounge, Poison Bar, a rooftop garden kitchen, and a boxing ring gym designed for both workouts and heated confrontations.
Big Brother: A Summer of Mystery is positioned to keep viewers guessing at every turn, while staying rooted in the franchise’s core format of social manipulation, secret alliances and surprise evictions.
