Ncuti Gatwa's shock regeneration is followed by an even bigger surprise as the show welcomes back a popular star of TARDIS past. BEWARE! Spoilers ahead!

Following on from the epic season two finale of Doctor Who, viewers were treated to a first look at the next chapter in the Whoniverse, The War Between The Land And The Sea, and new character imagery has been released of Russell Tovey as Barclay and Gugu Mbatha-Raw as Salt.