HBO Max Scores Exclusive ‘Doctor Who’ Streaming RightsJo Tro Do Plo Plo No: ‘Doctor Who’ Welcomes Back Familiar Monster Stay on target What scares the Doctor more: being locked in a room with half a dozen Daleks, or with only himself?Himself, duh.“There’s a lot him,” Twelfth Doctor Peter Capaldi said during a Q&A for Canada’s Space TV channel. “And there’s a lot of him that is dangerous and, not bad, but chaotic and uncontrollable. And so he has to keep a lid on all that.”Capaldi and co-star Pearl Mackie (new companion Bill Potts) quizzed each other in this two-minute clip (below), which answers hard-hitting queries like whether the Doctor has ever lost anyone inside the TARDIS (a resounding “no” from the Time Lord) and where/when Bill would most like to travel.“Maybe, like, 1960s, 1970s New York,” she says, earning the approval of her screen partner.Bill Potts—described by Mackie as “quite chatty, a bit mouthy, sometimes says the wrong thing”—makes her debut this Saturday, in Doctor Who season 10 opener “The Pilot.”“She questions things that haven’t been questions in a really long time, which is fun,” the actor told The Guardian, adding that “This is by far the biggest thing I have ever done, which is amazing. And also a bit mental.”Before landing the coveted role as the Doctor’s companion, Mackie appeared in musical comedy film Svengali (2013) and one episode of Doctors (2014), and spent a year acting in the West End production of The Curious Incident of the Dog in the Night-Time (2015-16).Now she’s rocketed to international fame—before even stepping into the TARDIS. (In response to recent rumors that Mackie will leave the series after one season, the BBC simply said viewers will have to “tune in to find out.”)But Bill isn’t the only newbie this year: The lunch lady is joined by alien Nardole (Matt Lucas, reprising his role from the 2015 and 2016 Christmas specials).“They discover the Doctor is a hero and then they discover the Doctor is clinically insane,” showrunner Steven Moffat said at the weekend’s BFI & Radio Times Television Festival.Saturday marks the beginning of the end for Capaldi and Moffat, who are retiring from Doctor Who after December’s holiday special; Broadchurch creator Chris Chibnall is slated to take over the long-running sci-fi show, starting with season 11.The hand-over, Moffat told The Telegraph, is “surprisingly straightforward,” adding that Chibnall is “actually the most experienced showrunner who’s come on to Doctor Who.”Tune in to BBC America on Saturday at 9 p.m. Eastern to see what’s in store for the Twelfth Doctor’s final run. And check out below what Moffat (who penned episodes one, six, 11, and 12) had to say about the writing team’s season 10 chapters.The first episode of Who‘s Patrick Ness-helmed spin-off Class follows at 10:10 p.m.Episode two: “Smile”By Frank Cottrell-Boyce (“In the Forest of the Night”)“There are some amazing ideas in this show, and some truly horrifying ones.”Episode three: “Thin Ice”By Sarah Dollard (“Face the Raven”)“Regency era, a frozen Thames, possibly an elephant!”Episode four: “Knock Knock”By Mike Bartlett“Mike was talking about the way floorboards creak—because, you see, he’s discovered the terrible truth…”Episode five: “Oxygen”By Jamie Mathieson (“Mummy on the Orient Express,” “Flatline,” “The Girl Who Died”)“One of my favorite episodes ever. I think you’re going to love this one. Clever and creepy, classic and brand new, this one’s got it all though.”Episode seven: “The Pyramid at the End of the World”By Peter Harness (“Kill the Moon,” “The Zygon Invasion”/”The Zygon Inversion”)“Basically, he [Harness] wanted to find quick and efficient ways of wiping out all life on Earth. … The terrors of the modern world are never far away when Peter is in control of the TARDIS.”Episode eight: “The Lie of the Land”By Toby Whithouse (10 DW episodes, including “Before the Flood,” “The Husbands of River Song”)“Hand on my heart, this is his best one.”Episode nine: “Empress of Mars”By Mark Gatiss (nine DW episodes, including “Sleep No More,” “Robot of Sherwood”)The episode features an Ice Warrior hive on Mars with “lots and lots” of Ice Warriors and “some Victorian soldiers.”Episode 10: “The Eaters of Light”By Rona Munro (1989 Doctor Who TV serial Survival)“I was properly surprised when she was happy to come in for a meeting, and I adored the script that came out of it. But I don’t think I really understood how wrong I’d got her, until I saw her wandering around the studio, taking selfies with Daleks, Weeping Angels, and the TARDIS. You see that Rona Munro, of international renown? She’s a Doctor Who fan, she is.”Stream all of Doctor Who now for free with your Amazon Prime membership.