'The Big Bang Theory' Season 9 Episode 4 Spoilers: Leonard, Penny move in together, Sheldon returns to 2003

The premiere episode of “The Big Bang Theory” Season 9 saw Penny (Kaley Cuoco) and Leonard (Johnny Galecki) becoming a married couple. The Episode 4, titled “The 2003 Approximation," will see them address the most complicated and difficult issue of their newly married life -- the living arrangements.

Leonard has been unable to move in with Penny because of Sheldon. The last time this topic came up -- just after Leonard and Penny’s engagement -- Sheldon got on a train and disappeared for a couple of months.

The Episode 4 spoilers of “The Big Bang Theory” Season 9 suggest that Leonard finally breaks the news to his roommate that he is moving in with his wife, and this time, Sheldon will be travelling back in time to deal with the sudden change in his life. He travels back to 2003 -- the year when he was living alone in the apartment, and he was not emotionally attached to anyone.

“When Sheldon learns of an impending change in his living arrangements, he decides to revert back to 2003, which was a much simpler time. Why? Because it was before he met Leonard,” according to the official synopsis.

Sheldon’s idea of going back to 2003 is turning his apartment into how it looked like before Leonard moved in, the leaked spoilers of Episode 4 of “The Big Bang Theory” reveal. Also he makes Leonard sign on a new document, to officially “unroommate” him.

In Season 6 of “The Big Bang Theory,” Sheldon was horrified when Amy (Mayim Bialik) suggested that he move in with her. And “The 2003 Approximation" will see Amy declining Sheldon’s offer to become his roommate. Also the leaked spoilers reveal that Sheldon screens potential candidates to find a new roommate.

He may not end up writing a new Roommate Agreement, as Penny and Leonard agree to spend some nights at Sheldon’s place, according to spoilers. They also tell him to spend some nights at their place. This means that Sheldon will continue to live with Penny and Leonard.

Meanwhile, the second storyline of "The Big Bang Theory" Episode 4 is about Howard (Simon Helberg) and Raj (Kunal Nayyar) forming a band, as Stuart (Kevin Sussman) wants live music at his comic book store. Howard and Raj write a song on "Thor meeting Indiana Jones."

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