Big Brother 10 is returning to its roots.

The claustrophobic CBS reality show is sealing 13 actual strangers -- no ex-lovers, secret twins or long-lost siblings this time -- inside a makeshift house on a Studio City, Calif., soundstage for the chance to be the last houseguest standing and take home the $500,000 grand prize.

''There's somebody for everyone in this cast,'' executive producer Allison Grodner says. ``It's going to be interesting to see people that come from such opposite worlds living together, which has always been a part of this show, but this season, we really do have our most diverse group ever.''

The contestants -- which will include a gay bull rider, a Hooters waitress, a professional bodybuilder and a 75-year-old former Marine -- will spend the summer competing in challenges and evicting each other while being monitored by more than 50 cameras. It's the first time since the show's third season that the houseguests are all strangers.

''When approaching this season, we wanted to look at what made this spark and last for 10 seasons,'' said Grodner, who has worked on Big Brother since the second season. ``Every season had its unique twist. I think, in a way, going back to basics and having the cast be all strangers is part of the twist of 10. Of course, there will be more.''

In last season's first-ever winter edition of Big Brother, which was quickly put into production because of the writers strike, contestants were partnered with each other and evicted as pairs for the first four weeks of competition. Grodner said a new Big Brother 10 gameplay twist would be introduced during the premiere episode Sunday.

''It's really a power-play,'' teased Grodner. ``The game will actually start before they enter the house.''

In recent seasons, contestants have come under fire outside the house for controversial remarks made inside the house. During the eighth season, Amber Siyavus said that Jewish people tend to be ''really money-hungry'' and ''selfish.'' Last season's winner Adam Jasinski was fired by a nonprofit autism organization because he used the word ``retards.''

''Those types of comments are not something we want to happen,'' said Grodner. ``It's a live show. It's not censored on the Internet. These are real people. We aren't telling them what to say, but we're not telling them what not to say either. Things do happen. We, of course, can choose what we put in the show, and we do so carefully.''

This season's contestants seem to be more aware of the repercussions of their actions from the outset. Before meeting their competitors or entering the house, the Big Brother 10 cast was individually interviewed by the AP while they were voluntarily sequestered -- no television, newspapers or telephones -- from the outside world in a Studio City hotel.

''If you make a mistake and say the wrong things, you may offend people and be known for that forever,'' said Steven Daigle, a 35-year-old geographic consultant and gay rodeo competitor from Dallas. ``People make mistakes. If I do make a mistake, I hope I can learn from it and know that was some part of my life that I was ignorant or uneducated about.''

The rooms inside the Big Brother house this season will be themed to different decades. The kitchen, for example, resembles a '50s diner while one of the bedrooms is filled with '70s-inspired furnishings. The timeliness extends to this season's crop of contestants. At 75, Gerry MacDonald will be the oldest Big Brother houseguest ever.

''Age does not bother me,'' MacDonald says. ``I hope it doesn't bother them.''

Libra Thompson, a married 31-year-old human resources representative from Spring, Texas, left behind her husband and three children -- including 4-month-old twins -- to participate in Big Brother 10.

''It's better for me that they're younger,'' says Thompson of her newborns. ``At 4 months old, they're not going to remember much. It's probably going to be a little bit more difficult for my 4-year-old. However, I'm going to stay focused and remember the reason I'm here, and that's the cash. That will help me.''

Prize money talks.

''I'm motivated because I'm a big fan of the show, but I'm more motivated that I have a chance to win $500,000,'' said Angie Swindell, a 29-year-old pharmaceutical sales representative from Orlando.

April Dowling, a 30-year-old car dealership finance manager from Higley, Ariz., said she doesn't think the Big Brother experience will be any more difficult than the time she had to spend 15 days in a ''tent city'' jail for drunk-driving charges. She also believes living in the house may remedy some of her obsessive-compulsive behaviors.

''I have seen a therapist,'' said Dowling. ``They tried to put me on anti-anxiety medication, but I'm not big on prescription medication. I just don't like to take it. I'm actually hoping the Big Brother experience will be therapeutic.''

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