A demon kidnaps Ben and Lisa to get to Dean. Sam and Dean are forced to join with an unlikely ally to free them. 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.