In The Big Bang Theory, fans got to know the couple of Penny and Leonard (Johnny Galecki), who ended up happily married after a long relationship that, like any real-life one, had its ups and downs.

Fans of The Big Bang Theory are still upset about one specific and contentious scene in Season 2 Episode 12 — The Killer Robot Instability — involving Penny and Howard. The episode aired back ...

Many of the characters who appeared in The Big Bang Theory only for a cameo helped add depth to key details that were crucial in the broader context. How could Leonard and Penny become a couple ...