[s1e5] The Hamburger Postulate -

"The Hamburger Postulate" (Season 1, Episode 5) of The Big Bang Theory introduces recurring character Leslie Winkle and explores romantic tension between Leonard and Penny. Aired on October 22, 2007, the episode follows Leonard's brief fling with Leslie and Sheldon's adjustment to a new dining routine. For more detailed information, visit Big Bang Theory Fandom .