Article continues below advertisementGet ready, Big Brother fans! Season 27 premiered on July 10 on CBS, and it's packed with excitement. The latest installment airs three times a week, featuring a supersized episode every Wednesday.Article continues below advertisementSource: CBS Broadcasting'Big Brother' Season 27 welcomes houseguests to the mysterious Hotel Mystère.Article continues below advertisementThis season, titled "A Summer of Mystery," brings houseguests into the mysterious Hotel Mystère, where viewers are already glued to the action.