CBS has announced the details of the penultimate episode of the season, "The Staircase Implementation", which will air May 17th.
"The Staircase Implementation" - Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator, on THE BIG BANG THEORY, Monday, May 17 (9:31-10:01 PM, ET/PT) on the CBS Television Network.
You can find more information about the episode in our Episode Guide.
| Title | Date Posted | Category |
| CBS Announces Episode 4.02 | 31st August 2010 | Show |
| CBS Announces Episode 3.21 | 13th April 2010 | Show |
| CBS Announces Episode 3.20 | 30th March 2010 | Show |
| CBS Announces Episode 3.19 | 15th March 2010 | Show |
| CBS Announces Episode 3.18 | 1st March 2010 | Show |