The wall comes down in Sam’s head and all hell breaks loose. Dean and Bobby are, for once, at a total loss on how to help him and are forced to stand by and do nothing while Sam breaks. The battle for heaven comes to a head. Watch free, streaming full episodes of Supernatural on cwtv.com. Supernatural Video: Watch supernatural full episodes, previews, clips, interviews and more video. Supernatural stars Jared Padalecki as Sam Winchester and Jensen Ackles as Dean Winchester. In Supernatural, Sam and Dean cruise America's highways in their 1967 Chevy Impala, battling supernatural threats.