Steven Yeun's Big Bang Theory Cameo Explained

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Here's Steven Yeun's brief but memorable The Big Bang Theory appearance explained. The Big Bang Theory was co-created by Bill Prady and Chuck Lorre. The latter has been dubbed the «King of Sitcoms,» thanks to a track record of hits such as Cybill, Dharma & Greg and Two And A Half Men. The Big Bang Theory itself arrived in 2007 and followed a group of incredibly nerdy friends and their (relatively) normal neighbor Penny. As is typical with most Lorre productions, the show was mostly met with critical eye-rolls and bad reviews.

However, The Big Bang Theory had a great comic ensemble — including breakout star Jim Parsons as Sheldon — and over time became one of the biggest sitcoms on television. The Big Bang Theory came to a close in 2019 after 12 seasons, and despite the fact the series was still doing well in terms of ratings, Parsons decided he wanted to move on to other opportunities. The Big Bang Theory is still in heavy rotation around the world despite having ended, and its spin-off series Young Sheldon has run for five seasons and will return for season 6 in September 2022.

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The Big Bang Theory has nabbed some famous guest appearances, including the late, great Stan Lee, Neil deGrasse, Mark Hamill, Two And A Half Men's Charlie Sheen and Katey Sagal. Some up-and-coming actors also made appearances on the sitcom before their big break, including future The Walking Dead star Steven Yeun. Appearing in The Big Bang Theory season 3's «The Staircase Implementation,» the story offers a flashback to how Sheldon and Leonard (Johnny Galecki) became roommates. The episode shows Leonard first arriving in their building, with Steven Yeun's Sebastian, who is Sheldon's former