Doctor Who: Everything We Know About Revolution Of The Daleks
2. Captain Jack Will Be Back!
John Barrowman is rumoured reprising his much loved character, immortal Time Agent Captain Jack Harkness.
The last time we saw Captain Jack was in the 2020 episode Fugitive of the Judoon, where he mistakenly teleported Graham on to his stolen spaceship, mistaking him for The Doctor. After also beaming Ryan and Yaz aboard, he was unable to retrieve The Doctor due to a Judoon forcefield, so he relays a message for them to pass on to her, warning not to give the 'Lone Cyberman' what it wants.
Unfortunately, in the episode The Haunting of Villa Diodati, she is pressured into giving Cyberium to Ashad, the lone Cyberman. He subsequently returns to the future where it is taken and absorbed by The Master, and then blown up by Ko Sharmus.
Barrowman admitted that his visit to Cardiff in October 2019 to renovate his house was a cover story for filming his cameo episode. This was also when the Daleks were spotted in Bristol, so could he have been involved in that filming too? He definitely has intel about the Cybermen and has encountered the Judoon, so could he be the one to help The Doctor escape her prison?