# S3-Scientific Breakthroughs

By [Big Bang Theory Fans](https://dylit.info/user/bigbangtheoryfans)

[Big Bang Theory](https://dylit.info/presence/Big-Bang-Theory/69442e7d871bdbf5e05799b4)

Season 3 picks up with the guys returning from the North Pole and Leonard and Penny finally acting on their mutual attraction, while Sheldon deals with betrayal and Wil Wheaton-level nemeses. Over 23 episodes the season deepens the Leonard–Penny relationship, develops Howard and Bernadette’s arc, and gives Sheldon some of his most iconic meltdowns and social experiments.