Sara Gilbert ("Roseanne"), who played Leonard's colleague & on-and-off girlfriend 'Leslie' in a 3 episode stint on The Big Bang Theory, has joined the show as a regular.
Sara Gilbert had a leading role on the hit ABC sitcom "Roseanne" where Johnny Galecki (Leonard) played her on-and-off boyfriend. Gilbert earned two Emmy nominations for that role.
| Title | Date Posted | Category |
| Episode 3, Sara Gilbert stars | 20th September 2007 | Show |
| CBS announces Gilbert joining show | 12th August 2008 | Show |
| Amazon posts Season 2 pre-order info | 18th April 2009 | Show |
| Episode 2.01 Ratings Press Release | 23rd September 2008 | Show |
| Episode 2.01 Ratings in Full | 23rd September 2008 | Show |