The Big Bang Theory is on its fourth season. In the fourth season Kaley Cuoco broke her leg in a horse-riding incident which makes her miss some of the episodes. The season starts off with all the five main characters of the show are having dinner. During their dinner Howard shows off an invention which he borrowed from the Jet Propulsion laboratory which is a robotic arm. He shows off on what the robotic arm can do like serving dinner and massage.

In the first episode a new character had been introduce which is Amy Farrah Fowler which is Sheldon’s new friend. Sheldon tells everyone about his plans on conceiving a progeny with Amy via in vitro fertilization and Penny will be the surrogate mother. But Penny suggested that to be able to do that Sheldon must first go out with Amy. But at the end of the episode Sheldon drop off his plan. In one episode of the season Sheldon and Amy had been very compatible with each other. They have created a game which was called counter-factuals. The group cannot handle that Amy is joining the group because they can barely handle Sheldon by himself then let alone having Amy. But that relationship ended immediately when Amy belittles Sheldon’s job. In another episode Penny kiss Leonard. They pretended to be together again for the visit of Penny’s father. And later on the season Penny will get back together with her ex boyfriend Zac.