Once Upon a Time will answer a pressing question on October 28: Who the heck is Doctor Whale?

The only prominent Storybrooke resident whose fairy tale identity is unknown, the truth will finally be told on the aptly-titled episode "The Doctor."

However, David Anders' mysterious physician is not featured in any of the already-released photos from that installment, most of which instead focus on an ogre attack in the Enchanted Forest and the sole survivor remaining from it.

Can Emma trust him? And who is it? Click around the following photos for the answer and check out the official ABC trailer for this Sunday's Once Upon a Time episode...