Watch The Big Bang Theory Online: Season 12 Episode 20

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Did Koothrappali discover alien life?

That's what he thought on The Big Bang Theory Season 12 Episode 20, and he had to find a way to prove it. 

However, he also realized that it came with a major caveat:

There would be naysayers and it could hinder his entire career. 

How did his friends feel about his apparent finding?

Watching The Competitors - The Big Bang Theory

Meanwhile, Leonard faced stiff competition when he revealed he wanted to be the principal investigator on a plasma physics study. 

Use the video above to watch The Big Bang Theory online right here via TV Fanatic. 

Catch up on all your favorite shows and reviews and join in the conversations with other fanatics who love TV as much as you.

Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.

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