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Doctor Whostar Peter Capaldi made his first appearance at New York Comic Con on Watch Fast Five OnlineFriday morning to discuss the show's upcoming tenth season and the 2016 Christmas special, which debuted an action-packed new trailer at the convention.

Capaldi appeared alongside Pearl Mackie -- who is taking over for Jenna Coleman's Clara as the Doctor's new companion, Bill, in Season 10 -- and Matt Lucas, who is joining the show as a regular following his guest role as Nardole in last year's Christmas special.

Here's what we learned from the NYCC panel:

• Showrunner Steven Moffat says Mackie's Bill "starts her journey with the Doctor in a surprising way," and promises that the reveals will keep coming over the course of the new companion's journey in Season 10, but declined to give further details about her introduction -- except to say, "I can promise you it’s really quite different."

• Capaldi notes that Bill "refreshes" the show, since she "comes from the real world; she doesn’t come from the world of Doctor Who, so she has to be introduced" to the Doctor's way of doing things. Moffat adds, "you’re getting to see the Doctor for the first time all over again through a new pair of eyes," thanks to the new companion.

• On that note, Moffat says that Season 10 will be a great starting point for new viewers, since they took the opportunity to reset things with Bill's introduction. "If I can give you a tone word for the season, it's 'brand new' ... episode 1 really is episode 1, it explains the entire mythos of Doctor Who,and you can start there," he promises.

• Bill won't appear in the Christmas special, which is titled "The Return of Doctor Mysterio," but Lucas' Nardole will be back for the festive installment. "Just as I was thinking it would be great if the Doctor had some kind of valet or butler who wouldn’t be very polite or obedient, Matt said he wanted to come back," Moffat says of bringing Lucas back to the fold. "He just kept volunteering to do more. It’s working better than we could’ve expected."

• Nardole will be "a little different" from the last time we saw him -- both a bit more grounded and, at times, even "sinister," per Moffat: "There are lots of layers to him."

• The Christmas special is inspired by Moffat's love of Superman -- specifically Clark Kent, who the showrunner describes as "awesome -- he goes around pretending he’s not a god; he doesn't tell the woman he loves that he's the person she's in love with -- it's a love triangle with two people." He says he's always wanted to write Clark Kent's journey, which is fitting, because Capaldi compares the tone of the special to the original Christopher Reeve Superman film, calling it, "a new, ironic, good-hearted superhero movie."

The panel also revealed a first look at Justin Chatwin's new superhero character, Grant, in costume -- check it out below.

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• Fans may have loved seeing the three most recent Doctors (Capaldi, Matt Smith and David Tennant) together in the 50th anniversary special "The Day of the Doctor," but Moffat says his position on the stunt is to "keep it rare" so that when the Doctors all converge, "the universe shakes ... I don't think we're going to do that again," at least during his tenure on the show.

During the NYCC panel, BBC America also previewed a first look at Doctor Whospinoff series Class, which featured an intriguing appearance from Capaldi's Doctor.

The new series takes place in the Doctor Whouniverse at Coal Hill School, the setting for the very first episode of the series in 1963. Showrunner Patrick Ness promised that the spinoff will feature Easter eggs and nods to iconic characters and storylines from across the show's run, but will also pave its own way with new characters and monsters.

The show stars Greg Austin, Fady Elsayed, Sophie Hopkins and Vivian Oparah as four Coal Hill School students who navigate a life of friends, parents, school work, sex, sorrow – and possibly the end of existence. According to the series description, "Coal Hill School has been a part of theDoctor Whouniverse since the very beginning, but that has come at a price. Time traveling over the years has caused the very walls of space and time to become thin. There’s something pressing in on the other side, something waiting for its chance to kill everyone and everything, to bring us all into Shadow."

Doctor Who Season 10 and ClassSeason 1 will premiere on BBC America in spring 2017.