Guest Stars
He had a recurring role as Professor Proton.
Who is Bob Newhart?
The names of all four.
What are Leonard Hofstadter, Sheldon Cooper, Rajesh Koothrappali, and Howard Wolowitz?
The names of the all three.
What are Penny, Bernadette Wolowitz-Rostenkowski, and Amy Farrah-Fowler?
Leonard's wife.
Who is Penny?
Sheldon and Amy's wedding is celebrated in the finale of this season.
What is the twelfth?
The four dress up and go to this every year.
What is comic-con?
Sheldon met Amy after Raj and Howard did this for Sheldon.
What is sign him up for online dating?
When failing to get into comic-con, Sheldon tracks down this famous star to see if he wants to join Sheldon's new comic-con.
Who is James Earl-Jones?
Amy got her a painting of the two of them as a show of friendship.
Who is Penny?