Leonard's book raises questions, and Amy guest stars on the new Professor Proton show.
Calificación de episodios
Reparto del episodio
51
34
9
4
2
1
- Sheldon Cooper
- Leonard Hofstadter
- Penny
- Amy Farrah Fowler
- Howard Wolowitz
- Bernadette Rostenkowski
- Raj Koothrappali
- Stuart Bloom
- Dr. Beverly Hofstadter
- Wil Wheaton
- Dead Detective