Billie Piper just made her shocking return to Doctor Who, replacing Ncuti Gatwa after his regeneration, but all may not be as it seems.

Billie Piper appeared to turn into the the 16th Doctor after Ncuti Gatwa’s regeneration during the season finale on Saturday.

Nafessa Williams was pictured on set filming Rivals series two alongside her co-stars Aidan Turner and Alex Hassell on Wednesday.