The title for the sixth episode of Doctor Who‘s new season has appeared online.

Directed by Daniel Nettheim (Line of Duty), Episode 6 formed part of the fifth block of filming on Season 10, which concluded this week.

The online CV of actor and comedian Laurent Maurel reveals that he will be playing the role of Nicolas in the episode, which is apparently titled ‘Extremis’.

At least one of Block 5’s two episodes is believed to feature the return of Michelle Gomez as Missy.

Location shooting for the filming block took place on the Canary Islands, which has previously doubled for New Mexico in ‘The Zygon Invasion’ & ‘The Zygon Inversion’, the Daleks’ planet Skaro in ‘The Witch’s Familiar’ and as the Doctor’s home planet Gallifrey in ‘Hell Bent’.

12 new Doctor Who episodes have been filming in Cardiff since June 2016 and will begin airing on BBC One this April.

Here’s everything we know so far about Season 10.

What do you think the title means? Let us know below…