All 279 episodes from all 12 seasons of the US sitcom. The show revolves around two university physicists, Leonard (Johnny Galecki) and Sheldon (Jim Parsons), their beautiful, free-spirited neighbour, Penny (Kaley Cuoco), and their friends, Howard (Simon Helberg), Rajesh (Kunal Nayyar), Amy (Mayim Bialik) and Bernadette (Melissa Rauch).