Doctor Who casually introduced a major new character in the latest episode

Doctor Who just threw a huge character plot twist in our laps (Picture: James Pardon/Bad Wolf/BBC Studios)Major spoilers for series 3 of Doctor Who ahead.Doctor Who dropped its third episode of the new season, Boom, and a pretty significant character just made a cameo.The latest episode of the sci-fi series – starring Ncuti Gatwa as the Fifteenth Doctor – saw the Doctor and companion Ruby Sunday (Millie Gibson) arrive on Kastarion 3 and face off against a deadly threat.A live landmin