The Big Bang Theory

Season: 9

Episode: 4

The 2003 Approximation

The 2003 Approximation

Air Date:12/10/2015

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. Also, Howard and Raj form a band to play at the Comic Book Store.

Episode: 17

The Celebration Experimentation

The Celebration Experimentation

Air Date:25/02/2016

After more than nine years together, the gang finally celebrates Sheldon’s birthday, surprising him with a special guest.