The premiere of Big Brother 27 opened with familiar fanfare, with 112 cameras and 113 microphones to record the HGs every move, but the mood quickly shifted to suspense as the season's theme - Hotel Mystère - unfolded on screen. Who will have what it takes to endure three months of the most challenging social experiment ever and claim the $750k prize? That remains a mystery!

Welcome to the Season Premiere of Big Brother!

Outside the newly designed house, sixteen new HGs in groups of eight were greeted by host Julie Chen Moonves, who teased that this summer would be filled with secrets, surprises, and hidden passageways.

Kelley is a web designer from South Dakota who grew up in a remote town of 50. Piloting herself to 42countries and all 50 states, she knows she has what it takes to win.

Zach's biggest asset is his athleticism, a former minor league baseball player turned marketing manager. He has a soft, sensitive side and is committed to his faith. He plans to turn the BB House upside down.

Ashley is an attorney from NYC, the Black Elle Woods, who will be a strategy assassin in the BB House, but boys are her biggest weakness. She wins at everything in her life. Case closed.

Rylie is a professional bull rider from Oklahoma who seeks the adrenaline rush, despite breaking numerous bones. One of his brothers has cerebral palsy who pushes him to be the best he can. The whole family are superfans, and Jesse was his favorite HG.

Amy is an insurance agent from Stockton, CA, who is a top 5 insurance agent in her region. Her three kids are looking forward to watching Mom on the live feeds. Her biggest worry in the BB House is blowing up on somebody.

Adrian is a carpenter from San Antonio, TX, who is a bit of a nerd. He loves science, and everything in his home has it's place. He has trained obsessively to be able to win any competition he needs to.

Luaren is 22 and from Lafayette, LA, who is a bridal stylist but wants to be a designer. She is counting on being seen as a ditsy, southern girl to hide that she is a BB Super Fan. Her ideal guy would be a gentle giant. If she can't win, she'll settle for the love of her life.

Keanu is a Personal Trainer from McKinney, TX (yes, named after Keanu Reeves) who is a huge nerd and part-time Dungeon Master. He gets along with just about everybody.

Julie informs them that they are about to embark on a summer of mystery, madness, and mayhem. Could a new best friend save your game, or will an unexpected enemy end it? Keep your friends close and your enemies closer, she advises.

Zach, Amy, Adrian, and Kelley are the first to enter Hotel Mystère. They gush over the rich theming and decor. There is Ivy on the walls in the kitchen and dining area, and the upstairs lounge has walls lined with paintings. There is a dry bar with a glass jar shaped like a gun filled with liquid. The HoH door has a hotel room number (1313). Amy loudly proclaims OMG at everything she sees.

But underneath the stairs, there's a clock next to a junction box, and it's ticking down from 10 minutes.

Keanu, Lauren, Ashley, and Rylie are the second group to enter the Hotel Mystère. Rylie takes off his cowboy hat to greet the other HG. Zach is immediately taken with Lauren. Keanu is taken with the toilet (it has a bidet). The first bedroom has a twisted sports lodge vibe with gremlin heads mounted on the wall, chairs hung like chandeliers, and six beds of different types. A red Anchor Engineering (1921) diving helmet sits in the corner.

Keanu finds a secret sliding door that leads to an art deco glamping second bedroom, in which three sets of bunk beds line one wall. The clock ticks down to 6 minutes.

Katherine is a fine dining server from Columbia, SC, who is a self-described raging feminist who sees guys as only a small part of her life and not the main focus. She lived a resilient childhood and plans to play all the other HG. By the time they realize it, it will be too late.

Vince is an unemployed 34yr old from West Hills, CA, who still lives at home with his parents. One of his first jobs out of college was delivering food to the CBS lot where the BB House was located. An intense competitor, he has fire in his heart and steam coming out of his ears

Mickey is an event curator from Atlanta, GA who is a city girl who enjoys city things. She caters to peculiar tastes but is a country girl at heart, at home on an ATV or a horse. She thinks she is easy to like and a good listener, so she expects the other HGs to trust her.

Jimmy is a 25yr old strategy consultant from Washington, DC, whose government contract was terminated by Twitter. He will use his strategic skills to manipulate the BB House, starting with claiming to be a tennis coach since he used to play competitive tennis. Franke Grande showed he could be a successful, loud, and proud gay man who had a future. After playing American Government and Politics, he's ready for the BB game.

Morgan is a gamer, model, content creator, and online streamer in LA who is always ready for competition. A former Division I track athlete, she's ready to kill it in the BB House.

Zae is a 23yr old door-to-door salesman in Phoenix, AZ who is used to rejection, having previously rejected his Mormon upbringing and tried many new things, like drinking coffee, alcohol, and dating. He's an academic athlete who plays chess, but will let the other HGs assume he's just a dumb jock.

Will loves being 50. A college sports podcaster from Charlotte, NC, he has three daughters, two of whom play high-level basketball. Having served 22 years in the military, he doesn't let his grand kids win. The other HGs are going to have to learn to lose, too.

Ava is an artist in New York City, painting aura portraits. The black sheep in a family of academics, she's a child of the 60's and flower power. She's not athletic, but as a starving artist, you have to have skills to survive in the big city.

Mickey, Zae, Katherine, and Jimmy are the third group to enter Hotel Mystère. They are greeted by the first eight. Jimmy instantly connects with Amy.

Vince, Morgan, Ava, and Will are the final group to enter the BB House. Rylie takes off his hat to greet the new HG. Will thinks for some of the other "kids", this is their first time away from home in an uncomfortable environment. Vince notes there are a lot of physical men in the BB House. Mickey is attracted to Keanu but thinks Rylie looks like a western cowboy Brad Pitt. Rylie confesses, if a woman catches his eye, he's only human,

The clock is ticking down to 5 minutes. Zae likes having another strong, fit guy like Keanu with whom to bond. For his part, Keanu thinks he found the Bill to his Ted. Julie calls the HGs to the living room where she reveals that they will all have to be sleuths this season, tapping into their powers of observation. There are secrets lurking behind the walls.

Julie notes there is an HoH Relic in the living room that holds the Power of the HoH, and the eccentric artwork throughout the house. As the clock ticks the final seconds to zero, she says, "Expect the..."

The lights go out and the HGs scream. In the night vision, we see the false tabletop holding the HoH Relic flip, hiding the relic from view. The lights come back on and the HGs realize not only is the relic gone, but Julie is also missing from outside the BB House; only a single heel remained on the stage.

The screen in the living room goes to static, then a mysterious, red masked figure calling himself "The Mastermind" appeared on screen, declaring that Julie — and the HoH Relic that controls the game — had been taken. "Until both are found," he warned, "your summer of mystery cannot continue."

The Mastermind disappears from he screen and an antique phone rings at the hotel's front desk. Lauren answers the phone. It's Julie!

She instructs the HGs to divide into two search parties - half will search for her, while the other half searches for the HoH Relic. The HGs who finds her and the HoH Relic will each receive a game-changing reward. Hurry, she implores, he's coming!

The HGs grab maps that assign them to one of the search parties. In the Mastermind's lair, the first eight HGs are on one side of an underwater river of molten lava (sharks are swimming outside for some unexplained reason). On the other side are eight doors, three on the top level and five on the bottom level.

The Mastermind has locked Julie behind one of the doors. The HGs have to solve a puzzle to form a bridge over the lava, then listen for Julie's voice behind one of the doors talking about something she was wearing tonight. The first HGs to identify the message that is true can open the door to save her.

Adrian, Vince, Amy, Lauren, Mickey, Zach, Eva, and Rylie are in the Julie search party. Adrian copies Zach's puzzle and is the first to complete is puzzle and begins listening to the cloned Julies behind the locked doors. Rylie and Mickey plan to throw the competition.

Adrian knows Julie wasn't wearing a jacket or a watch. Amy completes her bridge and realizes she didn't listen to the rules of the competition. Zach completes his bridge and, seeing that Adrian has already listened to all bottom doors and not found Julie, heads up to the second level. At the second door, he hears Julie talk about her bracelets. Since that is the only door Adrian hasn't listened to, he runs down to grab the card key and inserts it into the door.

He opens the door, and there is Julie!

Winning is a great thing, Zach says, but he doesn't know what he won. Could someone get me my shoe, Julie exclaims!

Back on stage, Julie sets the stage for the second competition to find the HoH Relic. Jimmy, Kelley, Will, Keanu, Morgan, Katherine, Ashley, and Zae are in this search party. In the Cavern of Stolen Treasures, rock tables scattered around Mastermind's lair hold different versions of the relic. The HGs who claims the authentic relic wins, but if an HGs claims a fake relic, they will fall into a trap door.

Each of the fake relics has four different colored jewels and four different keys carved into the relic. Morgan chooses to throw the competition. The Mastermind has scattered clues in the lair to tempt the HGs into making a guess. Keneau is the first to claim a relic, but falls screaming through the trap door.

Kelley is next to fall into the abyss, followed by Zae, Will, Morgan, and Katherine. Only Ashley and Jimmy remain. A final clue is revealed, and Jimmy thinks he's found the relic with the right gems and keys. He claims it and it is the authentic HoH Relic!

Zach rescued Julie and earned a $10,000 reward. Jimmy found the HoH Relic, earning him the power to name the four HGs who will play in the first HoH competition of the season, including himself.

Jimmy decides to compete himself and wants to make sure that none of the other three he chooses would put him on the block. Amy, Will, Ava, Kelley, Morgan, Lauren, and Katherine are all not interested. Zach says if nobody else wants to. Zae promises 100% safety if he's picked. Adrian feels safe with him and is fine playing. Keanu, Vince, and Ashley also promise safety. However, Ashley does not want to win.

Jimmy announces that Adrian, Vince, and Ashley will join him to compete for HoH.

Back in the Mastermind's lair, Adrian, Ashley, Jimmy, and Vince are standing next to vertical poles with three horizontal poles attached, connected to a detonator plunger about 10 feet away. In Destroy The Lair, they must balance different explosive Cores on the BB Blaster poles. Once all six Cores are balanced, they have to plunge the detonator. If the Cores remain balanced for 10 seconds, they win.

The Cores must be hung outside of the painted middle of the BB Blaster poles. Not only do the BB Blaster poles tilt side-to-side, but the vertical pole to which they are attached also tilts. The HGs struggle to keep the Cores balanced on one pole while they hang them on the other poles.

Vince adopts a strategy of moving the Cores inch by inch. Adrian has two poles and is working on the third. Vince is also working on his third, trying not to be distracted by the Core sliding off Adrian's bottom pole. As Adrian scrambles to gather his Cores, Vince rushes to his plunger, and the countdown begins.

After 10 seconds, Vince becomes the first HoH of the season!

Jimmy feels safest with Vince winning. Red warning lights begin flashing and a siren rings out. The HGs head back to the BB House for safety as a low-budget explosion rings out on edge of the island hiding the Mastermind's Lair.

Back in the living room , Julie reveals that the twist of nominating three HGs from last season is now a permanent part of the game, now called the BB Block Buster. Each HoH will nominate three Housemates for eviction, and they wil face off live on Eviction Night, with the winner coming off the block, leaving the remaining HGs to face the live eviction vote.

The Mastermind takes over the screen, with an ominous twist. They may have destroyed his lair but he is not done causing chaos. But he is not taking something from the game; he's adding something to it. Say hello to your new roommate.

The upstairs DR door creaks open, and a redhead in a red dress with red heels and gloves walks out. As she comes down the stairs, BB12 HGs and BB13 winner Rachel Reiley calls out, "Floaters, grab a life vest. Reality Royalty has officially arrived!"

It's not another HG, Ava says, it's The HG. Lauren fears her excitement has revealed she's a BB superfan. Jimmy wonders why everyone is cheering a huge threat in the game - they should be terrified!

The HGs start introducing themselves to Rachel when the Mastermind interrupts again. There is still one more mystery to solve. Rachel is officially in the game, but she is not the 17th HG. There has been an accomplice the whole time, one of them. The accomplice helped cut the lights and steal the HoH Relic, and unlocked the secret passageway that allowed Rachel into the game.

If the accomplice can do all of this and remain undetected, they would become a real HG, meaning 17 of you will by competing for the grand prize. But if a majority of the HGs guess who the accomplice is, they will be immediately removed from the BB House, leaving 16 HGs to play the game.

The HGs try to absorb the shock of Rachel coming into the BB House and suspecting everyone else of being the Mastermind's secret accomplice.

The witch hunt plays out Sunday, along with the first nominations of the season, after which the live feeds will begin at 9:31PM BBT:

The HGs try to figure out who turned out the lights, or how they did it with no light switches.

From outside the Big Brother House, love one another.