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Currently you are able to watch "The Big Bang Theory - Season 4" streaming on Netflix, Amazon Prime Video.
There are no options to watch The Big Bang Theory for free online today in India. You can select 'Free' and hit the notification bell to be notified when season is available to watch for free on streaming services and TV.
This season the Big Bang gang’s romantic universe expands. On the rebound from Penny, Leonard falls into the arms of Raj’s sister Priya. Sheldon gets a girlfriend, or rather a friend who is a girl: Amy, a dour neurobiologist who declares herself besties with Penny. Howard and Bernadette heat up. And so do Raj and Bernadette (at least in Raj’s Bollywood daydream).