The Big Bang Theory - Season 2 -

: Sheldon’s rigid "Roommate Agreement," his "three-strike" rule for Penny, and his struggle with social conventions (like gift-giving) are major comedic drivers.

: The season opens with the aftermath of their first date. Their romantic tension persists throughout, ending with Penny subtly hinting at her true feelings as the guys depart for a long expedition. The Big Bang Theory - Season 2

According to IMDb ratings and critical reviews, these are the season's highlights: According to IMDb ratings and critical reviews, these

: Penny becomes addicted to the online game Age of Conan , leading to Sheldon attempting to find her a date to break the obsession. Top-Rated Episodes

(Kaley Cuoco): Becomes deeply integrated into the group, even developing a brief addiction to online gaming.

: In the season finale, "The Monopolar Expedition," the four guys travel to the North Pole for three months to prove String Theory, leaving Penny alone to reflect on her feelings for Leonard. Top-Rated Episodes