Supernatural Season 9 Spoilers: Sam's Gadreel problem and Castiel's grace issue

Season 9 of Supernatural is back in full swing, and the storyline about Abaddon, the First Blade and the Mark of Cain have taken center stage. But lest we forget, there are also factions of angels out there that have fallen to Earth, and no one has found a way to send them back upstairs just yet.

According to the "Ask Ausiello" column at TVLine, the angelic components of Season 9 will come back in significant ways in upcoming episodes:

"Gadreel's little stint inside Sam? 'We're not done talking about it,' promises exec producer Jeremy Carver. 'There are more layers to it that are going to take a little while for even Sam to understand.' BONUS SUPE SCOOP: The stolen grace that Castiel used to become an angel again 'is an issue which will not go undealt with,' Carver teases."

In other news, the "Spoiler Chat" column at E! Online spoke to Jensen Ackles, who plays Dean Winchester, to get a scoop on the upcoming showdown between Dean and Abaddon:

"Will we see more Dean-Ab scenes in S9 or even S10 of Supernatural?
Oh, are you and Abaddon on nickname basis now? Rude! Any-whoo, Supernatural fans can definitely took forward to more scenes between the battling duo, as Jensen Ackles teases, 'I will say that I do know that that will come to a head. There will be a blow out there, and Dean will get the fight that he's been looking for.' We'll take your bets now!"

As we saw in Tuesday's episode, a fight with Abaddon could have some dire consequences for Dean.

What do you think will happen to Sam and Castiel with regard to their angelic issues? Let us know in the comments below.