The Big Bang Theory: The Nerdvana Annihilation

When Leonard and the guys buy a time machine prop from a classic 1960 movie, its arrival creates problems for Penny and she tells the boys that their obsession with comics and toys is "pathetic." Stung by Penny's outburst, Leonard decides to give up his time machine and other geeky pleasures for Penny, only to learn that she has a date.