The Internet is a battleground on Thursday's Big Bang Theory.

Sheldon (Jim Parsons) and Leonard (Johny Galecki) will face the wrath of an online bully who's trolling for a fight after they co-publish a paper. When push comes to shove (figuratively) and it's time to come face-to-face, it's safe to say that said bully is the last person Sheldon expects it to be. Any guesses?

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Meanwhile, during the ladies' girls' night out they unearth each other's embarrassing online history (the Internet is forever, duh). What does Google bring up? For starters, an old beauty pageant video with an awesome throwback to a '90s jam.

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