Watch The Big Bang Theory Season 9 Episode 4 online via TV Fanatic with over 7 options to watch the The Big Bang Theory S9E4 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, Verizon On Demand, and HBO MAX.
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On The Big Bang Theory Season 9 Episode 4, with his living arrangements about to change, Sheldon reverts to his 2003 self, before he met Leonard or Penny.