‘The Big Bang Theory’ Cast’s Dating Histories Through the Years: Kaley Cuoco, Johnny Galecki and More

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The Big Bang Theory, which ran for 12 seasons, followed the daily adventures of a group of scientists and their significant others until the show’s conclusion in May 2019.

The show, which premiered in September 2007, starred Jim Parsons, Kaley Cuoco, Johnny Galecki, Simon Helberg, Kunal Nayyar, Mayim Bialik and Melissa Rauch. While filming the sitcom, the cast got particularly close. Cuoco and Galecki, specifically, even secretly dated for two years before calling it quits in December 2009.

After the two actors amicably split, their onscreen counterparts (Penny and Leonard, respectively) were still going strong.

“We weren’t weird, which is what was weird,” Cuoco told Haute Living Los Angeles in May 2019. “It was a mutual breakup, and you can rarely say that. Johnny and I were friends first, then obviously we dated.”

Scroll below to revisit The Big Bang Theory cast’s dating history through the years: