As Supernatural showrunner Sera Gamble says in the following video preview for Friday's episode, the show loves to follow-up the dark episodes (like the death of Rufus) with a lighter one. So prepare for plenty of laughs with the return of Supernatural in "My Heart Will Go On."

Video: Watch a Clip from This Episode>>

In this extended preview, we get the scoop on what goes down. An alternate reality has been created because Balthazar didn't like the movie Titanic, so he went back in time and made sure the ship didn't crash on its maiden voyage. So not only did he alter history, but he may have ruined the careers of Leonardo DiCaprio and Kate Winslet.

In the future, Sam and Dean figure this out and get angry that Balthazar "Butterfly Effect-ed" history. Sadly, even though certain things have changed, it turns out Ashton Kutcher still made that awful movie.

If that's not enough, the episode also brings back Ellen Harvelle, who was killed in the real timeline last season. Watch the full preview and hear Gamble talk about the new episode.



Supernatural airs Friday at 9pm on the CW.

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(Image and video courtesy of the CW)