On the first Supernatural episode of 2010, Sam and Dean go undercover as patients at a mental hospital.

Their goal? To get at a monster. The result?

The siblings discover they have some serious issues of their own with which to deal. You'll need to tune in to find out what happens, but you can enjoy a sneak peek at "Sam, Interrupted" below:

[video url="http://www.tvfanatic.com/videos/sam-interrupted-clip/" title="Sam, Interrupted Clip"] [/video]

For more on what's to come this winter and spring, browse around our Supernatural spoilers section.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.