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?
Meanwhile, Leonard faced stiff competition when he revealed he wanted to be the principal investigator on a plasma physics study.
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.