The Nerdvana Annihilation

Summary
Leonard accidentally buys a full size prop of the time machine from the movie The Time Machine. As the guys attempt to bring it up to their apartment they block the stairs and Penny ends up missing work. She scolds Leonard for having all these toys and so he tries to get rid of them all. But Sheldon points out Penny’s hypocrisy and she apologises.

Critics
"An excellent story which showcases the three main characters and their dichotomy perfectly. It also advances the overall story of Leonard trying to become the right man for Penny. With the time machine providing some laughs this is an excellent episode overall." - The TV Critic's Review