In the finale episode of season 5, Howard Wolowitz (Simon Helberg) boards a Soyuz rocket and travels to the International Space Station (ISS). In season 6, he is called to work on the ISS.
With the help of Bernadette (Melissa Rauch) and Amy (Mayim Bialik), Penny (Kaley Cuoco) tries to figure out her feelings for Leonard (Johnny Galecki). While Sheldon's graduate assistant, Alex Jensen (Margo Harshman) is interested in Leonard.
Howard is in a dilemma — he must choose between wife or mother to live with once he returns to Earth. Back on land, Bernadette is annoyed as Howard keeps talking about space. And while rearranging Howard and Bernadette's closet, Sheldon (Jim Parsons) finds a letter from his father, which he had sent for his 18th birthday.
The Big Bang Theory Season 6 Web Series Cast, Episodes, Release Date, Trailer and Ratings