Could David Tennant return to Doctor Who at Christmas? All the clues and theories: It may still be a while away, but theories are already swirling about this year's Doctor Who Christmas special – including whether Tenth and Fourteenth Doctor star David Tennant could be back for more. Ad Showrunner Russell T Davies is set to pen the festive special, which comes after the twist that saw Ncuti Gatwa's departing Doctor regenerate into none other than Billie Piper, who… https://www.radiotimes.com/tv/sci-fi/doctor-who-david-tennant-return-theory-explained/?utm_source=dlvr.it&utm_medium=mastodon