Watch The Big Bang Theory Online: Season 12 Episode 4

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Who the heck is Tam?

That's what everyone wondered on The Big Bang Theory Season 12 Episode 4 when one character heard through the grapevine that the person was Sheldon's childhood best friend. 

In true Sheldon fashion, he kept quiet about the person who had such a profound impact on his life for all this time. 

But Leonard decided to take matters into his own hands to get to the root cause of Sheldon staying mom about his figure. 

Meanwhile, Bernadette and Penny decided it was time to get to know Anu, Raj's fiancée, so they took her out to dinner to get all the intel on her. 

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

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

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