Season 7 Episode 21 episode 21

Supernatural Season 7 Episode 21 "Reading Is Fundamental" Sneak Peek 2

Supernatural Season 7 Episode 21 "Reading Is Fundamental" Sneak Peek 2

Could the tablet, or as Cas calls it, "the word from the vault of the earth," have been written by a Transformer? Not quite, as shown in this second sneak peek for tonight's episode of Supernatural, Season 7 Episode 21 "Reading Is Fundamental." (Yep, this is definitely a Ben Edlund episode!)