For those unaware of the Toymaker, the character first appeared in 1966, and was seen separating William Hartnell's First Doctor from his companions and forcing them to play childish games before being they could return to the TARDIS.
Now, after months of waiting it has finally been confirmed – Harris is indeed playing the Toymaker, with this being the character's first appearance in the long-running sci-fi show in 57 years.
It wasn't the only reveal in the trailer, which also confirmed that Jemma Redgrave is back as Kate Lethbridge-Stewart and that Donna will get her memories of the Doctor back – for better or worse...
- Chris Chibnall explains why Thasmin never kissed in Doctor Who
- Doctor Who Midnight director praises Russell T Davies and David Tennant
The trailer also included another sneak peek at Ncuti Gatwa's Fifteenth Doctor, who will debut following David Tennant's return to the show, in which he is now playing the Fourteenth Doctor.
Returning showrunner Russell T Davies said in a statement alongside the trailer's release: "This is just the start, as the fever starts to burn. We’re heading for a November full of Doctor Who surprises, for fans and new viewers alike. Stay alert!"
Try Radio Times magazine today and get 10 issues for only £10, PLUS a £10 John Lewis and Partners voucher delivered to your home – subscribe now. For more from the biggest stars in TV, listen to The Radio Times Podcast.