The Big Bang Theory

The Big Bang Theory is a completed CBS ensemble sitcom created by Chuck Lorre and Bill Prady. It begins with Caltech physicists Leonard Hofstadter and Sheldon Cooper meeting Penny, the aspiring actor who moves into the apartment across the hall. Leonard wants a more ordinary social and romantic life, while Sheldon relies on rigid routines and treats everyday interaction like a problem with one correct answer. Their friends Howard Wolowitz and Raj Koothrappali broaden the group’s mix of science, fandom and social awkwardness. As Bernadette Rostenkowski and Amy Farrah Fowler become central characters, the series develops from a neighbor comedy into a story about friendship, partnership, work and gradual change. Scientific ideas, comic books, games and genre culture supply many jokes, but the long arc depends on the ensemble learning to accommodate one another. Johnny Galecki, Jim Parsons and Kaley Cuoco lead the cast. The 12-season story is distinct from the prequel Young Sheldon and later franchise spin-offs.

Where to watch (checked October 7, 2026): Warner Bros. Discovery identifies HBO Max as the U.S. streaming home of all 279 episodes. HBO Max branding, subscription tiers and title licensing vary internationally, so verify the local catalog before subscribing.

Key facts

• The series premiered on CBS on September 24, 2007.
• Chuck Lorre and Bill Prady created the series with Warner Bros. Television.
• The completed run contains 12 seasons and 279 episodes; the finale aired May 16, 2019.
• Warner Bros. Discovery records 55 Emmy nominations and 10 wins.

Official sources: Warner Bros. Discovery series record; Television Academy record.