A trip to the pet store ends in a fight after Amy learns Sheldon has applied for a one-way mission to colonize Mars. Meanwhile, Leonard surprises Penny with a very "adult" purchase, and Raj gets into trouble when he snoops around Emily's apartment.
Episode rating
Cast of episode
55
27
7
4
4
2
1
- Sheldon Cooper
- Raj Koothrappali
- Emily Sweeney
- Amy Farrah Fowler
- Penny
- Howard Wolowitz
- Leonard Hofstadter
- Bernadette Rostenkowski