Sheldon's relationship with Stephen Hawking is threatened over a game of "Words with Friends," and Penny secretly enrolls in a class at the local college.
Sheldon's relationship with Stephen Hawking is threatened over a game of "Words with Friends," and Penny secretly enrolls in a class at the local college.
Guest Cast
![Stephen Hawking](https://static.tvmaze.com/uploads/images/medium_portrait/8/20181.jpg)
Stephen Hawking
voices HimselfCast Appearances
![Penny](https://static.tvmaze.com/uploads/images/medium_portrait/175/439563.jpg)
Kaley Cuoco
as PennyEpisode Discussion
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