Misha Collins has revealed new details about his upcoming Supernatural return.

Castiel (Collins) appeared to die earlier in the show's seventh season, but will reappear in forthcoming episode 'The Born-Again Identity'.

"Sam (Jared Padalecki) is in really dire straits," the actor told TV Guide. "Dean (Jensen Ackles) is definitely looking to lean on the character for help."

Collins added that his angel character has "changed" since his last appearance in 'Hello, Cruel World'.

"There's a kind of big experience that is being kicked off at the end of my first episode [back]," he explained. "Cas is going to go through yet another transformation and on to another kind of struggle and journey. Once again, he'll be put through the wringer."

The former series regular added that he would be happy to return to Supernatural if the show is picked up for an eighth season.

"There's no reason why it couldn't happen," he suggested. "I have been resurrected from the dead around four times. So no amount of death or destruction seems to be insurmountable in the Supernatural universe."

Supernatural returns to The CW on Friday, March 16 at 9/8c.

> Supernatural: Jeffrey Dean Morgan 'unlikely to return'

Watch a promo for the return of Supernatural below:

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