Some of the most watched episodes of "The Big Bang Theory" are "The Bakersfield Expedition," "The Deception Verification" and "The Occupation Recalibration," as of 2015. "The Bakersfield Expedition" is the thirteenth episode of the sixth season and had 20 million U.S. viewers. "The Deception Verification" and "The Occupation Recalibration" are the second and thirteenth episodes of season seven, and they had 20.44 and 20.35 million views, respectively.
"The Bakersfield Expedition" involves the guys attempt to take a trip to Bakersfield Comic-Con. They dress up in "Star Trek" costumes and stop at a desert that served as one of that show's filming locations, but their car is stolen. A side plot follows the girls reading comic books. This episode was the highest rated of season six.
"The Deception Verification" is about Leonard arriving home early to surprise Penny. Sheldon and Amy break into Penny's apartment under the mistaken assumption that she's cheating on Leonard. The side plot involves Howard using his mother's massage cream that contains estrogen and makes him emotional. This episode was the highest rated of season seven.
In "The Occupation Recalibration," Penny quits her job to dedicate more time to her acting career. Leonard tries to be supportive although he doesn't agree with her decision. A geologist also asks Amy out, and Bernadette must replace Howard's comic book after damaging it.