After Balthazar changes history and keeps the Titanic from sinking, Fate intervenes and begins killing those that would have died on the ship. 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.