CBS has announced the details of episode 2.20, which will air April 13th and guest star Ugly Betty's Kevin Sussman as Penny's geeky love-interest.
"The Hofstadter Isotope" - While a fellow comic book-loving pal of the guys romances Penny, Leonard and Wolowitz venture out into the world of "Ladies' Night" at a local bar, on THE BIG BANG THEORY, Monday, April 13 (8:00-8:30 PM, ET/PT) on the CBS Television Network.
There isn't an episode of The Big Bang Theory tonight as CBS is airing a How I Met Your Mother double-bill instead. A new episode will air next week (March 30th), entitled "The Dead Hooker Juxtaposition", but there will be a rerun the week after (April 6th) of "The Vartabedian Conundrum".
| Title | Date Posted | Category |
| Episode 3.10 Announced | 19th November 2009 | Show |
| Episode 2.22 Announced | 27th April 2009 | Show |
| Episode 2.21 Announced | 14th April 2009 | Show |
| Episode 2.19 Announced | 17th March 2009 | Show |
| Episode 2.15 Announced | 2nd February 2009 | Show |