‘Supernatural’ Season 9, Episode 13 Live Stream: Watch ‘The Purge’ Online Free Via CW Live Streaming

"Supernatural" season 9, episode 13 airs tomorrow night - find out where to watch "The Purge" online via a free live stream of the CW for "Supernatural" season 9, episode 13.

If you can't make it to a TV by 9pm EST tomorrow night to catch "Supernatural" season 9, episode 13, click here or here to watch "The Purge" online via a free live stream of the CW.

If that doesn't work, the CW also offers episodes on their website to watch online after an episode airs.

Spoiler alert! According to TVGuide.com, the official synopsis for this week's episode reads: "Sam and Dean work undercover at a spa to investigate murders in which the victims were hundreds of pounds lighter after their deaths. All of the victims attended the spa for weight loss; and the brothers suspect that witches are to blame."

In the episode, the brothers go undercover, according to spoilers: Sam is hired as a fitness instructor, and Dean takes on kitchen duty. Dean steals some tainted food and passes out, and the boys soon realize that someone is drugging guests at the day spa and sucking all of the fat out of them until they die. Talk about an extreme weight loss method!

"Supernatural" season 9, episode 13 airs on Tuesday, February 4 at 9:00 PM EST on the CW.