Laura Spencer

Sheldon learns of an impending change in his living arrangements and decides to revert back to 2003, a simpler time before he met Leonard and Penny.

Sheldon pushes Leonard and Penny to set a date.

Sheldon and Amy try hanging out as friends when they spend Thanksgiving together at the aquarium. Also, Wolowitz reluctantly agrees to volunteer at the soup kitchen with Bernadette, Raj and Emily.

Bernadette tries to negotiate peace between Sheldon and Wolowitz; Penny receives an embarrassing offer and Raj wants Amy to write to a woman on his behalf.

Sheldon applies for a one-way mission to colonise Mars.

After having to deal with a sick Sheldon, Leonard, Penny and the gang try to treat themselves to a Sheldon-free weekend.