The American television sitcom The Big Bang Theory, created and executive produced by Chuck Lorre and Bill Prady, premiered on CBS on September 24, 2007, and ended on May 16, 2019, launching the self-titled media franchise, followed by the American comedy spin-off prequel television series Young Sheldon, created and executive produced by Lorre alongside Jim Parsons and Steven Molaro, which premiered on CBS on September 25, 2017 and concluded on May 16, 2024, with the third series in the franchise, a spin-off sequel to Young Sheldon entitled Georgie & Mandy's First Marriage, to premiere in the last quarter of 2024.