Big Brother's 21st season premiered on with the houseguests electing Jackson Michie as the first-ever "camp director" of Camp BB and leaving him with a huge decision to make that will ultimately eliminate one player from the game.

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Tuesday night's Big Brother premiere broadcast on CBS began with host Julie Chen revealing to viewers a lot of surprises are in store for this summer.

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"First impressions have never been more important. That's because they will be immediately faced with a game-changing decision that will give one houseguest an unprecedented power -- a power that will put everyone's game in jeopardy. And that is just the beginning," Julie shared.

"This summer, these houseguests will face twists and turns that no one has ever seen before."

Viewers were then introduced to Jackson, a 23-year-old server from Nashville, TN, who currently resides in Los Angeles, CA, who called himself a "mama's boy;" Nicole Anthony, a 24-year-old preschool aide from Long Island, NY, who said she's single and ready to mingle; and Tommy Bracco, a 28-year-old Broadway dancer from Staten Island, NY, who's a Big Brother Super Fan.

Next up was Kathryn Dunn, a 29-year-old digital marketing executive from Irving, TX, who currently resides in Dallas, TX, who is a pageant queen and former NBA dancer; Ovi Kabir, a 22-year-old college student from Oakridge, TN, who currently resides in Knoxville, TN; and Kemi Faknule, a 25-year-old marketing strategist from Elkridge, MD, who currently resides in Brooklyn, NY, who said she's a "reformed mean girl."

Holly Allen, a 31-year-old wine safari guide from Lander, WY, who currently resides in Los Angeles, CA, then introduced herself and revealed she's got a country strength the other houseguests probably don't have, as she grew up on horseback.

Holly is also the ex-girlfriend of former The Bachelor: Winter Games villain Luke Pell. She was the on-again, off-again girlfriend Luke reconciled with last year and used as the explanation for why he "ghosted" on Stassi Yaramchuk following their appearance on The Bachelor Winter Games.

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After Holly, fans met Jack Matthews, a 28-year-old fitness trainer from Chicago, IL, who currently resides in Tampa, FL, who boasts long, flowing hair and adores his black lab.

The first four people to enter the Big Brother house were Tommy, Jack, Kathryn, and Nicole. They were then followed by Jackson, Ovi, Holly and Kemi.

Tommy thought Jack was gorgeous, and Kathryn was very attracted to Jackson.

Afterward, viewers were introduced to Christie Murphy, a 28-year-old boutique owner from Staten Island, NY, who currently resides in Keyport, NJ, who recently got out of a relationship with a significantly older woman; Sam Smith, a 31-year-old truck driver from West Nanticoke, PA, who currently resides in Mountain Top, PA, and is a proud father of two boys; and Isabella Wang, a 22-year-old public health analyst from Mount Olive, NJ, who currently resides in Los Angeles, CA, and grew up with very strict Chinese parents.

Isabella said she had two sides -- the intelligent and conservative side and then a part of her that's wild and loves tattoos.

Fans then met Nick Maccarone, a 27-year-old child mental health therapist from Sewell, NJ, who considers himself outgoing and intended to "screw with people's minds" on Big Brother; Jessica Milagros, a plus-size model in her thirties from Chicago, IL, who currently resides in Oak Park, IL; Cliff Hogg III, a 53-year-old petroleum engineer from Houston, TX, who's competing for his family; and Analyse Talavera, a 22-year-old college soccer star from Northridge, CA, who currently resides in Simi Valley, CA, and noted people underestimate her because of her looks.

Next up was David Alexander, a 29-year-old photographer from Atlanta, GA, who lost a lot of weight and became an athlete.

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The next four houseguests to enter the Big Brother house were Cliff, Isabella, David, and Analyse.

Cliff recognized he'd be an easy target since he's the older guy in the house, and Jack and Jackson caught eyes and determined they were going to be in a bromance this summer.

Jack and Jackson were excited to work out and eat together all summer long.

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Sam, Nick, Jessica and Christie joined the Big Brother cast next.

Tommy revealed Christie had dated someone in his family for the last seven years and he was "shocked" to see her. However, he planned to act like he didn't know her so that there wouldn't be a target on their backs.

Christie thought Tommy's presence could be "horrible" or "amazing" for her time in the Big Brother house. Christie's ex-girlfriend is apparently a member of Tommy's family.

Jack thought Holly was super cute, and Jackson was immediately drawn to Analyse.

"It's going to be a long summer," Jackson joked when looking at the brunette beauty.

But the women all seemed attracted to Jack, whom they thought looked like Jason Momoa, who plays Aquaman in the movie.

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Suddenly, Julie asked everyone to gather in the living room, and she welcomed everyone to "Camp BB."

Because everyone was asked to "expect the unexpected," Julie explained the houseguests must elect "a camp director" and they should think long and hard about this decision because he or she would be safe for the first week.

"The camp director will not only impact the first Head of Household competition, but could single-handedly put your game in jeopardy," Julie announced.

The houseguests then went into the backyard and voted for a camp director one at a time. They were not allowed to vote for themselves.

Cliff, Jessica, Jackson, and David all briefly campaigned to become the camp director. Cliff said he wanted to avoid being the first target as the oldest guy in the house, and Jessica said she'd like to be in charge as a well-balanced Libra.

The girls, plus Tommy, gathered together and decided they'd like to see Jessica become in power. Jessica loved "the girl power" in the house and was thrilled they had her back.

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But Jackson really wanted to ensure his safety this week since he's a strong male and could be viewed as a target. He therefore formed an alliance with Jack and suggested they should just win back-to-back-to-back HoH competitions.

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Once Nicole heard from Jackson, she considered switching her stance on whom to vote for because she didn't want the strong men to view her as a weak girl and pick her off.

Jackson thought he had Kat, Tommy, Nicole, Isabella, Christie, and Jack on his side.

It then became time for the houseguests to elect a camp director.

Analyse was shown voting for Jessica so there would be a strong female voice in the house, while Jack voted for Jackson. Nicole voted for Jackson, and Kathryn voted for Jessica.

In the end, Julie announced the vote had come down to Jessica and Jackson. Jessica received four votes, and Jackson earned himself 10 votes.

Jackson therefore became the first-ever camp director at "Camp BB" and everyone else was splashed with slime.

Jessica was angry because a lot of people clearly lied to her.

Julie explained to Jackson that not only would he be safe at the first live eviction, but as the camp director, he also must choose to "banish four houseguests."

The four houseguests chosen "would be out of the Big Brother game."

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Those four would then go head to head in a battle for their Big Brother lives, and three would win their way back into the house. The fourth person, however, would see his or her game come to an end before the first live eviction even takes place.

"The only way to stay safe is to make sure Jackson doesn't banish you," Julie announced.