Currently you are able to watch "Supernatural" streaming on Amazon Prime Video.
There are no options to watch Supernatural for free online today in India. You can select 'Free' and hit the notification bell to be notified when show is available to watch for free on streaming services and TV.
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When they were boys, Sam and Dean Winchester lost their mother to a mysterious and demonic supernatural force. Subsequently, their father raised them to be soldiers. He taught them about the paranormal evil that lives in the dark corners and on the back roads of America ... and he taught them how to kill it. Now, the Winchester brothers crisscross the country in their '67 Chevy Impala, battling every kind of supernatural threat they encounter along the way.