Aired Monday June 17, 12:00pm - 12:30pmon E4

The Big Bang Theory

Series 3 Episode 20: The Spaghetti Catalyst

Sheldon tries to hide his friendship with Penny from Leonard but it isn't long before his double life is exposed to Penny and Leonard. Can Penny and Leonard keep their friendships with Sheldon without hurting each other?

Original air date
Cast and crew
  • Anthony RichDirector
  • Johnny GaleckiLeonard Hofstadter
  • Jim ParsonsSheldon Cooper
  • Kaley CuocoPenny
  • Simon HelbergHoward Wolowitz
  • Kunal NayyarRaj Koothrappali