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The Super Bowl kicks off Sunday as American football seeks to put a scandal-plagued season behind it, with this year's spectacle featuring a Katy Perry concert, ultra-expensive commercials and a compelling clash between Seattle and New England. The extravaganza is expected to draw a whopping 115 million viewers -- or about one in three Americans -- and amounts to an unofficial holiday in the United States, where even those with no interest in the sport gather at countless Super Bowl parties. This year's championship comes with the National Football League battling back from a season of turmoil, accused of complacency and even conspiracy in its handling of issues ranging from domestic violence to concussion dangers. The latest controversy -- accusations that the New England Patriots intentionally deflated footballs -- has dominated news coverage in the days leading up to the game.