Spoiler Room: Agents of S.H.I.E.L.D., The Flash, Supernatural, and more spoilers

Welcome to the Spoiler Room, a safe place for spoiler addicts to come on a weekly basis to learn what’s coming next on their favorite shows and, hopefully, get a few of their own questions answered. If you want scoop on a specific show, send your questions to spoilerroom@ew.com.

Is it weird that I’m ‘shipping Coulson and Roz on Agents of S.H.I.E.L.D.? — Trevor

I don’t judge, but it’ll take a while for Coulson to let Roz in. “Coulson has obviously been in the spy game for so long that he couldn’t pick up the signals Roz was throwing his way and assumed the worst,” the S.H.I.E.L.D. bosses tell me. “So the audience will soon get to see if he’s able to allow someone in for the first time on the series or if he’s too far gone in the game of espionage.”

Anything about Harry or his daughter on The Flash and whether he’ll be bonding with any of the team? — Pang

As we saw last week, the team is understandably hesitant to trust Harry, but he will find at least one ally. “The person with whom he ironically finds the most common ground with is Caitlin,” EP Andrew Kreisberg says. “There’s a lot of stuff in upcoming episodes where there’s a lot of hurt feelings, obviously on Barry’s part, Joe’s part and Cisco’s part. We collectively decided that Caitlin would be the one who was able to — because Caitlin is more mature that everyone else there — both [see] the necessity for including him in things, and is also the one who has grown up enough that she can look past it and see that making a connection with him has value.”

Loved seeing John Winchester on Supernatural! Any other characters returning soon? — Emily

I’ll give you a hint: Oh ya! No? Didn’t get it? It’s Sheriff Donna! “Sheriff Donna calls the boys because it seems like there is a crazed psycho-killer that’s putting on Halloween masks,” Jared Padalecki says. “The boys have to come in and find out what’s powering these masks and if it’s something that’s possessed or if it’s a ghost.” And of course, it’s something that Padalecki says is “going to provide a lot of laughs,” because, have you met Donna?

Anything NCIS would be great. — Marcus

The show’s big holiday episode this year will feature even more insight into Ducky’s past than we’ve ever seen before. “Christmas episodes have become an NCIS tradition and what could be better than spending the holidays with young Ducky in England circa 1972?” says EP Gary Glasberg. “This is a heartwarming story that brings gifted actor Adam Campbell back to NCIS and introduces us to Ducky’s complicated family. Prepare for a very emotional trip down Ducky’s memory lane.”

What does the future look like for one or all of my favorite Arrow characters: Felicity, Oliver and Diggle? — Steph

I choose Diggle, specifically about how he’s handling the new information Damien Darhk provided about his brother’s death. “Diggle’s really dealing with the grief and sense of loss,” EP Wendie Mericle says. “He’s grieving two losses, really — the idea of who his brother was and confirmation of why his brother was murdered. The truth is, he knows that his brother was involved in this bad, shady stuff, but he doesn’t know how or when or why. He doesn’t know Andy’s point of view. He’s never heard Andy’s side of the story.” With that said, “We’ll definitely be seeing Andy coming up in future episodes and we’ll get some pretty shocking answers about what happened to him,” Mericle promises. Bonus: Since Mama Smoak is returning next week, I thought I’d also share this tidbit: “We’ll find out in future episodes that she’s going to be having a romantic relationship with somebody on the show,” Mericle says. “It’s going to be fun.” Guesses in the comments, but it’s totally this, right?

I’m dying for anything on the Shelby-Caleb-Clayton love triangle on Quantico. — Sarah

How about a new complication? It looks like the triangle will soon turn into a love square. “We will be introducing Caleb’s mom and [Clayton’s] wife in the near future,” showrunner Josh Safran reveals. Odds on her being a HBIC? Update: She’s been cast! And it looks like I was right about the HBIC thing.

Any spoilers you can tell us about Supergirl? — Rocky

Kara won’t just use her powers to keep aliens in line. “In episode 3, Reactron, who’s a Superman villain, shows up in town, and Kara says to the DEO, ‘How are we going to get him?’ ” executive producer Andrew Kreisberg says. “They say, ‘Well, we’re not. We find aliens. We’re not going to expose this covert government agency for a human villain. Let the police handle it, or call Superman.’ By the end of that episode, Kara has turned the DEO around. They have all of these amazing resources and they could be doing more with it.”

So, is Vincent just a human now on Originals? — Jane

Well, he’s technically still a witch, and according to Yusuf Gatewood, there are some events coming up that will force him to let go of his “magical pacifism.” When put in a situation where he has to defend his city, Gatewood teases that there “might be some things that lead to Vincent picking up the wand again.” Sadly, there is no actual wand.

Is Weller’s dad actually innocent on Blindspot? — Dina

When it comes to what actually happened to Jane, his involvement is still TBD. “One of Weller’s big arcs this season is trying to find some sort of solace with his father,” EP Martin Gero says. “He still lied about where he was the night she disappeared, and so as they try to mend their fences, all of that needs to get addressed.” However, his father’s recent breakdown “melted some of the ice around Weller’s heart a little bit, and so he’s in the direction of maybe realizing that he was wrong about his father.”

Any November sweeps scoop on Castle? — Mark

An upcoming outing will feature a bit of an undercover situation, according to showrunner Alexi Hawley — though he won’t reveal whether it involves Castle or Beckett. However, he does say that it won’t be the last time they do it. “We think it’s really fun to see that stuff going on, so you’ll definitely see that from time to time,” he says.

Best news I’ve heard all week: I was on set for Once Upon a Time’s 100th episode. I know things. Waaaaay too many things. Here’s what you’re allowed to know.

That’s a wrap on this week’s Spoiler Room. Be sure to email your questions to spoilerroom@ew.com or tweet them to @NatalieAbrams.

Additional reporting by Samantha Highfill.