Ratings: 9.46 million
Sheldon was nicknamed "Moon Pie" by his grandmother.
The title refers to guest star Summer Glau's starring in the TV series The Terminator.
Nobel Prize winning physicist George Smoot was given a cameo after writing to the producers and telling them he was a fan of the series.
This episode marks the first mention of Sheldon's beloved (but as of yet unseen) Mee Maw.