1: Sheldon's long lost brother appears, causing chaos

2: Penny's secret past as a scientist is revealed

3: Leonard and Raj accidentally switch bodies, hilarious consequences ensue

4: Amy wins a Nobel Prize, but for the wrong reason

5: Howard and Bernadette become the new power couple of the science world

6: Stuart inherits the comic book store and transforms it into a successful business

7: Raj discovers a new element, but it has unforeseen side effects

8: Sheldon finally learns how to drive, with disastrous results

9: The gang travels back in time and meets their younger selves

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