It's Ben Edlund's episode So you could expected the unexpected ! 'Supernatural' Episode 8.13 Photos: 'Everybody Hates Hitler'

I love it Jeremy gave us more clues about this episode

JEREMY : It's Ben Edlund's episode ! It brings us to places we never thought we could go !!" 

Source https://www.youtube.com/user/MiI2aCIe?feature=watch

Source http://www.youtube.com/user/televisionpromos?feature=watch

The brothers look into the death of Rabbi Bass, who spontaneously combusted. Things get complicated when they find out that the rabbi was researching Nazi necromancers. A golem that belongs to the Rabbi's grandson, Aaron, attacks them. However, since Aaron doesn't know how to control him, everyone is in danger.

                                                            Credit pics CW

                          This Episode will air February 6,2013