The Big Bang Theory Season 2 Episode 23 The Monopolar Expedition airs Monday May 11 at 8/7c on CBS.

LEONARD AND PENNY RECONSIDER THEIR FEELINGS FOR ONE ANOTHER, ON THE SECOND SEASON FINALE OF “THE BIG BANG THEORY,” MONDAY, MAY 11

“The Monopolar Expedition” - Penny is conflicted when Leonard and his friends decide to spend the summer working - at the North Pole, on the second season finale of THE BIG BANG THEORY, Monday, May 11 (8:00-8:30 PM, ET/PT) on the CBS Television Network.

SERIES REGULARS:

Leonard: Johnny Galecki
Sheldon: Jim Parsons
Penny: Kaley Cuoco
Wolowitz: Simon Helberg
Koothrappali: Kunal Nayyar

GUEST STARS:

Mrs. Wolowitz: Carol Ann Susi
Dr. Koothrappali: Brian George
Mrs. Koothrappali: Alice Amter

WRITTEN BY: Eric Kaplan & Richard Rosenstock

DIRECTED BY: Mark Cendrowski

RATING: TVPG-DL

The Big Bang Theory Season 2 Episode 22 The Classified Materials Turbulence airs Monday May 4 at 8/7c on CBS.

PENNY MAKES A SURPRISING REVELATION ABOUT LEONARD ON HER DATE WITH STUART, ON “THE BIG BANG THEORY,” MONDAY, MAY 4

“The Classified Materials Turbulance” - Things begin to look up for Leonard when Penny makes a surprising revelation on her second date with Stuart. Meanwhile, Wolowitz enlists his friends’ help when he discovers a critical design flaw in his project for NASA, on THE BIG BANG THEORY, Monday, May 4 (8:00-8:30 PM, ET/PT) on the CBS Television Network.

SERIES REGULARS:

Leonard: Johnny Galecki
Sheldon: Jim Parsons
Penny: Kaley Cuoco
Wolowitz: Simon Helberg
Koothrappali: Kunal Nayyar

GUEST STAR:

Stuart: Kevin Sussman

STORY BY: Chuck Lorre & Lee Arohnson

TELEPLAY BY: Bill Prady & Steven Molaro

DIRECTED BY: Mark Cendrowski

RATING: TVPG-DL

The Big Bang Theory Season 2 Episode 21 The Vegas Renormalization airs Monday April 27 at 8/7c on CBS.

SHELDON PLANS THE WEEKEND OF HIS DREAMS WHEN LEONARD AND THE OTHER GUYS GO TO VEGAS, ON “THE BIG BANG THEORY,” MONDAY, APRIL 27

Jodi Lyn OKeefe (Prison Break) Guest Stars As A Working Girl the Guys Encounter in Vegas

“The Vegas Renormalization” Leonard and Koothrappali take a heartbroken Wolowitz to Las Vegas, leaving Sheldon locked out of his apartment and forced to bunk with Penny, on THE BIG BANG THEORY, Monday, April 27 (8:008:30 PM, ET/PT) on the CBS Television Network.

SERIES REGULARS:

Leonard: Johnny Galecki
Sheldon: Jim Parsons
Penny: Kaley Cuoco
Wolowitz: Simon Helberg
Koothrappali: Kunal Nayyar

GUEST STARS:

Mikayla: Jodi Lyn OKeefe

STORY BY: Jessica Ambrosetti & Nicole Lorre & Andrew Roth

TELEPLAY BY: Steven Molaro

DIRECTED BY: Mark Cendrowski

The Big Bang Theory Season 2 Episode 20 The Hofstadter Isotope airs Monday April 13 at 8/7c on CBS.

A TRIP TO THE COMIC BOOK STORE LEADS TO AN UNUSUAL ROMANCE, ON “THE BIG BANG THEORY,” MONDAY, APRIL 13

“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.

SERIES REGULARS:

Leonard: Johnny Galecki
Sheldon: Jim Parsons
Penny: Kaley Cuoco
Wolowitz: Simon Helberg
Koothrappali: Kunal Nayyar

GUEST STAR:

Stuart: Kevin Sussman

WRITTEN BY: David Goetsch

DIRECTED BY: Mark Cendrowski

The Big Bang Theory Season 2 Episode 19 The Dead Hooker Juxtaposition airs Monday March 30 at 8/7c on CBS.

PENNY IS NO LONGER THE QUEEN BEE WHEN A SEXY NEW NEIGHBOR MOVES INTO THE BUILDING, ON “THE BIG BANG THEORY,” MONDAY, MARCH 30

“The Dead Hooker Juxtaposition” - Penny develops a rivalry with a sexy female neighbor who threatens to become “The New Penny” in the building, on THE BIG BANG THEORY, Monday, March 30 (8:00-8:30 PM, ET/PT) on the CBS Television Network.

SERIES REGULARS:

Leonard: Johnny Galecki
Sheldon: Jim Parsons
Penny: Kaley Cuoco
Wolowitz: Simon Helberg
Koothrappali: Kunal Nayyar

GUEST STARS:

Mrs. Wolowitz: Carol Ann Susi
Alicia: Valerie Azlynn

WRITTEN BY: Steven Molaro

DIRECTED BY: Mark Cendrowski

To go along with the renewal of Two and a Half Men, CBS has also renewed the show that leads off its Monday night comedy lineup. The two year renewal will bring The Big Bang Theory seasons 3 and 4 through the 2010-2011 television season.

The Big Bang Theory Season 2 Episode 18 The Work Song Nanocluster airs Monday March 16 at 8/7c on CBS.

PENNY’S FRIENDS TAKE OVER HER HOME BUSINESS, ON “THE BIG BANG THEORY,” MONDAY, MARCH 16

“The Work Song Nanocluster” - Penny’s home hair products business becomes a complete nightmare when a caffeine-addled Sheldon takes over, on THE BIG BANG THEORY, Monday, March 16 (8:00-8:30 PM, ET/PT) on the CBS Television Network.

SERIES REGULARS:

Leonard: Johnny Galecki
Sheldon: Jim Parsons
Penny: Kaley Cuoco
Wolowitz: Simon Helberg
Koothrappali: Kunal Nayyar

STORY BY: Bill Prady & Lee Aronsohn

TELEPLAY BY: Dave Goetsch & Richard Rosenstock

DIRECTED BY: Mark Cendrowski

RATING: TVPG-DL

The Big Bang Theory Season 2 Episode 17 The Terminator Decoupling airs Monday March 9 at 8/7c on CBS.

A TRAIN TRIP TO SAN FRANCISCO TAKES A MAJOR DETOUR WHEN THE GUYS DISCOVER BEAUTIFUL SCI-FI ACTRESS SUMMER GLAU IS ONBOARD, ON “THE BIG BANG THEORY,” MONDAY, MARCH 9

Dr. George Smoot, Nobel Laureate and Father of the Big Bang Theory of Creation, Also Makes a Cameo

“The Terminator Decoupling” - A train trip to San Francisco takes a major detour when Leonard (Johnny Galecki), Sheldon (Jim Parsons), Wolowitz (Simon Helberg) and Raj (Kunal Nayyar) discover that beautiful sci-fi actress Summer Glau (”Terminator: The Sarah Connor Chronicles”) is onboard, on THE BIG BANG THEORY, Monday, March 9 (8:00-8:30 PM, ET/PT) on the CBS Television Network. The episode also features a cameo by Nobel Laureate Dr. George Smoot.

Summer Glau is well known to television audiences for her roles in “Terminator: The Sarah Connor Chronicles” and “Firefly.” A sci-fi favorite, Glau is a two-time Saturn Award winner and a Teen Choice Award nominee.

Dr. George Smoot, recipient of the Nobel Prize in Physics, as well as the Einstein Medal, is one of the world’s most renowned astrophysicists. His research helped cement the big bang theory of the universe.

THE BIG BANG THEORY, created by Chuck Lorre and Bill Prady, is a comedy centered around Leonard and Sheldon, brilliant physicists who understand how the universe works but struggle in their daily interactions with people, especially women. The series stars Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg and Kunal Nayyar.

SERIES REGULARS:

Leonard: Johnny Galecki
Sheldon: Jim Parsons
Penny: Kaley Cuoco
Wolowitz: Simon Helberg
Koothrappali: Kunal Nayyar

GUEST CAST:

As herself: Summer Glau
As himself: Dr. George Smoot

STORY BY: Bill Prady & Dave Goetsch

TELEPLAY BY: Tim Doyle & Stephen Engel

DIRECTED BY: Mark Cendrowski

RATING: TV14-D