‘Doctor Who’ Season 10 Spoilers: 8 Things To Know About Peter Capaldi’s Final Episodes

“Doctor Who” is finally back! After being on hiatus for all of 2016 (with the exception of the annual Christmas special), Season 10 will premiere Saturday on BBC America. There are a few things you should know about this season before jumping back into the TARDIS though.

Goodbye Twelve: “Doctor Who” Season 10 is Peter Capaldi’s final run as the Doctor. He’ll be leaving the show at the end of the season. The actor explained that he wanted to make sure he wasn’t “phoning in” his performance. “The schedule is very intense, and I began to wonder, how many different ways can I find to say, ‘The time vortex is going to open up and destroy the entire universe as we know it, unless we blow up that model spaceship over there’?” he told the New York Times when explaining his departure.

Nardole: The quirky companion from the last two Christmas specials will return as well. “There’s a very definite reason [he is still with the Doctor]. And we do see different sides to him as the series goes on,” Lucas said at a premiere screening (via Radio Times). “He does evolve throughout the series, and he does become a bit less broad… most of the time.”

The New Companion: As always, the Doctor will pick up a new female companion too. Bill (Pearl Mackie) will be introduced, and her human perspective makes this a perfect opportunity for new viewers to jump in.

“She’s just someone who has great potential, and the Doctor thinks that potential is not being realized, and decides it would be fun to help her,” Capaldi told the NYT. “It’s good, because Pearl is not particularly an expert on ‘Doctor Who,’ so everything is new to her, as it was to her character. It meant that she wasn’t bringing any baggage to it.”

The New Relationship: As with all companions, expect Bill and the Doctor to have a unique connection. “He is different with her — he’s quite a different Doctor with Bill,” showrunner Steven Moffat told Digital Spy. “From the off, he adores her ... The Doctor is now dealing with somebody who questions him and skewers him from time to time. So you’ll see how he’s different, and occasionally disconcerted.”

Don’t expect a romance between the two, though. Bill is a lesbian. Unless Capaldi regenerates into a female doctor, this Doctor-companion relationship is going to be strictly platonic.

Old Monsters: With Capaldi’s last season upon him, he requested one classic villain return: the Mondasian Cybermen. These particular Cybermen were only seen in a 1966 episode of the series, but they’ll return in the finale of Season 10.

Steven Moffat Is Leaving: The showrunner, who took over for Russell T. Davies in Season 5, will step down after Season 10. Chris Chibnall will take his place.

John Simms: Though Missy (Michelle Gomez) will be in Season 10, it seems her former face, played by John Simms, will somehow make an appearance as well. It sounds like the Master might even be around for multiple episodes. “He was there for quite a few weeks, he was actually filming on the streets and nobody saw him, and he was in the studio,” executive producer Brian Minchin told Radio Times.

The New Spinoff: After the “Doctor Who” Season 10 premiere, audiences should stick around. Capaldi will also appear in “Class,” the new spinoff set in the Whoniverse. The show follows the students at Coal Hill School, a place the Doctor has visited many times. It’s become a hub for alien activity after being a stopover for the TARDIS so often, and a group of teens will have to deal with the extraterrestrials.

“Doctor Who” Season 10 premieres Saturday at 9 p.m. EDT on BBC America.