Nerds on a Mission

The men have a mission on the episode "The Zarnecki Incursion." They must find the person who hacked into Sheldon's online game account.
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The Big Bang Theory Season 4 Episode 19 Quotes

Three thousand hours, three thousand hours clicking on that mouse, collecting weapons and gold. It's almost as if it was a huge waste of time.

Sheldon

Leonard: You called the police because someone hacked your World of Warcraft account?
Sheldon: What choice did I have? The mighty Sheldor, level 85 blood elf, hero of the Eastern kingdoms has been picked clean, like a carcass in the desert sun. Plus, the FBI hung up on me.