One such question is whether Craig Parkinson, of Line of Duty fame, will be returning as slithering politician the Grand Serpent, who we discovered was Vinder's (Jacob Anderson) old boss – and the pair did not end on the best of terms, to put it mildly.
The actor himself has now weighed in on whether he'll be back after he was asked by fans on Twitter.
"It seems like there's got to be more with Vinder in the future... at least I hope," one fan asked, to which Parkinson replied: "Oh there is."
He went on to reassure another fan, who tweeted that they'd hoped Parkinson would be in it "waaayyyy more", telling them not to panic and teasing there is "much more to come".
News of the character's return isn't too surprising. Eagle-eyed fans who pored over the Doctor Who: Flux trailer might have noticed exterior shots of Parkinson and Vinder that weren't shown in last night's episode.
Parkinson himself also posted a picture of a costume and make-up test for the Grand Serpent last night, along with the caption "be seeing you... soon" so fans can expect his return in the coming episodes.
Read more about Doctor Who:
- Doctor Who brought back another Doctor, and it’s about time
- Is Doctor Who still hiding a secret regeneration?
- Is Doctor Who’s Once, Upon Time a pilot episode for a Fugitive Doctor spin-off?