Tonight, The Big Bang Theory celebrates a milestone 100th episode. Tonight's episode is titled "The Recombination Hypothesis" and it's all about the possibility of change.
In the episode, Leonard extends a spur of the moment invitation to Penny for them to go out on a romantic dinner date. The question, of course, is whether the pair will get back together after their date. This leaves their friends pondering the ramifications if that happens.
Below is a sneak peek for the episode featuring Penny and Leonard on their date. Tonight's episode is set to run an extra minute long, so be sure to adjust your DVRs! In addition, CBS has put together a countdown video of their favorite top 10 scenes of the show to celebrate tonight's 100th episode of The Big Bang Theory. You can also watch that below.
Use the arrows above to browse through photos for the episode and don't miss a new episode of The Big Bang Theory tonight at 8:00 p.m. ET on CBS.
"The Recombination Hypothesis" -- Sheldon (Jim Parsons, right) ponders how everything might change when Leonard (Johnny Galecki, left) offers Penny a spur of the moment invitation to a romantic dinner for two, on the 100th episode of THE BIG BANG THEORY, Thursday, Jan. 19 (8:00 - 8:31 PM, ET/PT) on the CBS Television Network. Photo: Robert Voets/Warner Bros. �©2012 Warner Bros. Television. All Rights Reserved.
"The Recombination Hypothesis" -- The girls (Mayim Bialik, second from left; Melissa Rauch, second from right) ponder how everything might change when Leonard (Johnny Galecki, far right) offers Penny (Kaley Cuoco, far left) a spur of the moment invitation to a romantic dinner for two, on the 100th episode of THE BIG BANG THEORY, Thursday, Jan. 19 (8:00 - 8:31 PM, ET/PT) on the CBS Television Network. Photo: Robert Voets/Warner Bros. �©2012 Warner Bros. Television. All Rights Reserved.
"The Recombination Hypothesis" -- Sheldon (Jim Parsons, right) ponders how everything might change when Leonard (Johnny Galecki, left) offers Penny a spur of the moment invitation to a romantic dinner for two, on the 100th episode of THE BIG BANG THEORY, Thursday, Jan. 19 (8:00 - 8:31 PM, ET/PT) on the CBS Television Network. Photo: Robert Voets/Warner Bros. �©2012 Warner Bros. Television. All Rights Reserved.
"The Recombination Hypothesis" -- The guys (Jim Parsons, second from left; Kunal Nayyar, second from right; Simon Helberg, far right) ponder how everything might change when Leonard (Johnny Galecki, far left) offers Penny a spur of the moment invitation to a romantic dinner for two, on the 100th episode of THE BIG BANG THEORY, Thursday, Jan. 19 (8:00 - 8:31 PM, ET/PT) on the CBS Television Network. Photo: Robert Voets/Warner Bros. �©2012 Warner Bros. Television. All Rights Reserved.
"The Recombination Hypothesis" -- Everything might change when Leonard (Johnny Galecki, left) offers Penny (Kaley Cuoco, right) a spur of the moment invitation to a romantic dinner for two, on the 100th episode of THE BIG BANG THEORY, Thursday, Jan. 19 (8:00 - 8:31 PM, ET/PT) on the CBS Television Network. Photo: Robert Voets/Warner Bros. �©2012 Warner Bros. Television. All Rights Reserved.
"The Recombination Hypothesis" -- The guys (left to right: Jim Parsons, Kunal Nayyar, Simon Helberg) ponder how everything might change when Leonard offers Penny a spur of the moment invitation to a romantic dinner for two, on the 100th episode of THE BIG BANG THEORY, Thursday, Jan. 19 (8:00 - 8:31 PM, ET/PT) on the CBS Television Network. Photo: Robert Voets/Warner Bros. �©2012 Warner Bros. Television. All Rights Reserved.
"The Recombination Hypothesis" -- The guys (left to right: Jim Parsons, Kunal Nayyar, Simon Helberg) ponder how everything might change when Leonard offers Penny a spur of the moment invitation to a romantic dinner for two, on the 100th episode of THE BIG BANG THEORY, Thursday, Jan. 19 (8:00 - 8:31 PM, ET/PT) on the CBS Television Network. Photo: Robert Voets/Warner Bros. �©2012 Warner Bros. Television. All Rights Reserved.
"The Recombination Hypothesis" -- Sheldon (Jim Parsons) ponders how everything might change when Leonard offers Penny a spur of the moment invitation to a romantic dinner for two, on the 100th episode of THE BIG BANG THEORY, Thursday, Jan. 19 (8:00 - 8:31 PM, ET/PT) on the CBS Television Network. Photo: Robert Voets/Warner Bros. �©2012 Warner Bros. Television. All Rights Reserved.
"The Recombination Hypothesis" -- Everything might change when Leonard offers Penny (Kaley Cuoco) a spur of the moment invitation to a romantic dinner for two, on the 100th episode of THE BIG BANG THEORY, Thursday, Jan. 19 (8:00 - 8:31 PM, ET/PT) on the CBS Television Network. Photo: Robert Voets/Warner Bros. �©2012 Warner Bros. Television. All Rights Reserved.
"The Recombination Hypothesis" -- Bernadette (Melissa Rauch, left) and Amy (Mayim Bialik, right) ponder how everything might change when Leonard offers Penny a spur of the moment invitation to a romantic dinner for two, on the 100th episode of THE BIG BANG THEORY, Thursday, Jan. 19 (8:00 - 8:31 PM, ET/PT) on the CBS Television Network. Photo: Robert Voets/Warner Bros. �©2012 Warner Bros. Television. All Rights Reserved.
In the first sneak peek, it's kind of awesome to see how much Leonard has changed. He's so confident and 'dare I say it'… smooth.
i was laughing so hard when the girls went ooooooh that took me back to elementary school