Premieres: Special casting episode on Wednesday, June 21, at 8pm ET, followed by the official premiere on Thursday, July 6, at 8pm ET

When to catch it: Tuesdays at 8pm ET, Thursdays at 8pm ET and Saturdays at 9pm ET on CBS

Starring: Newswoman by day, Big Brother host by night, Julie Chen and the 12 houseguests competing for $500,000

In a nutshell: After six seasons, you know the drill — but this year there's a twist! Here's the deal: Viewers will be reunited with some of the most memorable, entertaining and controversial houseguests from previous installments of BB when 20 candidates are chosen to compete for spots in Big Brother All-Stars: America's Choice. After seeing all 20 candidates, America will vote on CBS.com (starting at midnight and continuing until Wednesday, June 28, at 11:59pm ET) for their favorite 12 former houseguests. During the premiere, host Julie Chen will announce the lucky 12, who will immediately enter the house. We'll then follow the relationships and conflicts of players who live together in a house outfitted with dozens of cameras and microphones recording their every move, 24 hours a day. One by one, the houseguests will vote each other out. At the end of three months, the last remaining houseguest will receive the grand prize of $500,000. Although living together in a confined space won't be anything new to the houseguests, choosing between any pre-existing relationships and building new alliances could be a challenge. Who do you think America will pick? Which houseguest can't you live without seeing again? Who will get sent packing first? Who will couple up and get it on? Will a former winner take home the big paycheck again? Talk about Big Brother: All Stars here...

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