The name of this Tvshow is The Big Bang Theory Season 3 released in 2009 and it's main theme is Worlds collide in Season 3 A love affair with Penny has opened a big, wide, wonderful world of romance for Leonard. But Sheldon likes the world just the way it was, thank you. All of which makes for a zany comic triangle with brainy, clueless Sheldon and practical, grounded Penny hilariously vying for the role of hypotenuse.