"There is more to Supernatural than what is seen in the show. This is the birth of a new anime and you've never seen the characters like this before!"
from the WB Japan website
In June 2010, the Warner Brothers Japanese site announced the production of a Supernatural anime to be released in January 2011.
The studio producing this will be MADHOUSE. The first season will be twenty-two episodes covering the first two seasons of the original, remaking some episodes and adding new ones, to include the brothers' childhood, focus on secondary characters, and anime-only enemies.
Yuya Uchida (Soul Eater's Dr. Franken Stein, Naruto Shippūden's Rinji) will dub the role of Sam, while Hiroki Touchi (Trinity Blood's Abel Nightroad, Bokurano's Kokkpelli) will dub the role of Dean. Both actors dubbed these same roles for the live-action version in Japanese. Source
At the Rising Con Spain 2010, Jensen and Jared confirmed the project and that they'd seen and approved the artwork for Sam and Dean. They also said they would voice the first couple of English language episodes.
- See also Doujinshi