Interestingly enough, Sam and Dean Winchester were apparently voiced by Yûya Uchida and Hiroki Touchi in the Japanese version of "Supernatural: The Animation," the very duo who reportedly dubbed the voices of the original series for broadcast in that country. Given that the Japanese version reportedly went all out to secure the voice talents of their Winchester boys, it's all the more perplexing that the U.S. version couldn't do the same.
Though Jensen Ackles has never openly commented on why he couldn't commit to voicing his beloved "Supernatural" character for the animated series, it's believed he may have just been too busy at the time to contribute to all 22 episodes. And a glance at his IMDb page would seem to confirm the actor was exceedingly busy with voice work and his steady "Supernatural" gig leading up to the production of "Supernatural: The Animation."
Still, Ackles did manage to carve out a little time from his busy schedule for "Supernatural: The Animation," turning up to voice Dean for the last two episodes of the series. Titled "All Hell Breaks Loose: Part 1" and "All Hell Breaks Loose: Part 2," those episodes were arguably the best of the entire run, with Sam and Dean pushed to extreme measures and beyond to save the world (and themselves) from some very serious trouble.
And even as strong as Annakin Slayd's work was in the first 20 episodes of "Supernatural: The Animation," those last two episodes prove nobody does Dean Winchester quite like Jensen Ackles.
