The Big Bang Theory ran for 12 seasons from 2007 to 2019. Created by Chuck Lorre and Bill Prady, the series also starred Johnny Galecki, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Sara Gilbert and ...

In the pilot episode of The Big Bang Theory, Sheldon Cooper is so strapped for cash that he goes to a sperm bank with Leonard to make some money. But in the next season, Sheldon gives Penny some ...