An eagle-eyed fan has spotted a cast photo from the Series 10 set which seems confirms three new guest stars for the opening episode.
The picture, which was snapped by @fandomfan99 shows several head shots and confirms the names of three characters who look as though they belong to the same very strangely named family.

#dwsr in mask yesterday: pic.twitter.com/IrVtlWcJd3

— fandoms4life (@fandomfan99) 6 July 2016

Mina Anwar (pictured above left) has been cast as a character named Goodthing. Anwar previously played Gita, the mother of main character Rani, in The Sarah Jane Adventures, and we’d wager that the two are not related at this stage.
Ralf Little (centre) will play Steadfast. Little already has a connection to Doctor Who, he voiced Guy Fawkes in the Doctor Who: The Adventure Games episode The Gunpowder Plot. You’ll probably recognise Little most for his work on sitcoms like The Royale Family and Two Pints of Lager and A Packet of Crisps.
And finally, Kaizer Akhtar (right) is playing Praiseworthy. Akhtar has previously appeared in Tut, The Honourable Woman and Baby Jake.
Filming on the first episode began in Cardiff last month with director Lawrence Gough calling the shots on Pearl Mackie’s first scenes as new companion Bill while ushering in the return of Matt Lucas as The Husbands of River Song’s Nardole.
Doctor Who Season 10 will air on BBC One in spring 2017.