Supernatural's Castiel will need all the help he can get to restore his failing grace, but the angel will be unwilling to turn to the only man who has the answers.

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Cas (Misha Collins) brought Metatron's (Curtis Armstrong) schemes to a crashing halt at the end of season 9, but he chose to place the conniving storyteller in heaven's jail rather than run him through with an angel blade (see video below). While this means Cas an really question the man who stole his grace in the first place, the rebel angel won't be willing to trust his nemesis.

"I think probably Metatron is key to getting Cas' grace back, and Cas knows that," Collins said at the 2014 San Diego Comic-Com, according to Spoiler TV. "We establish that early on in the season and we also establish that Cas is unwilling to cooperate with Metatron or ask a favor of him. So that's a non-starter for him."

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At least that will be Cas' mindset at the start of the season. As his grace dims and death looms closer, the rebel angel may change his mind.

"However I would not be surprised if later on in the season it turns out that Metatron does end up rectifying the situation somehow because he certainly is - as far as we know - the one who knows how to do that or where Cas' grace is," Collins explained.

Find out more when Supernatural returns to The Cw on Oct. 7 at 9 p.m. ET.