The Extract Obliteration

The Extract Obliteration is the sixth episode of the sixth season of the CBS sitcom, The Big Bang Theory. The airing date of this episode is yet to be announced.

Plot
Sheldon is happy when Stephen Hawking accepts his invitation on a popular online game called Words With Friends and starts spending his time on the game. Meanwhile, Penny decides to go back to school by taking a history class at a community college and is torn about whether to tell Leonard about it.