Get ready for a blast from the past on Doctor Who.

Playing the Twelfth Doctor wasn't Peter Capaldi's first foray into the world of Doctor Who, and the BBC series may final address the Pompeii-sized elephant in the room as season 9 progresses.

Capaldi first entered the Whoverse during the Russell T Davies era, causing problems for the Tenth Doctor (David Tennant) and Donna (Catherine Tate) as they battled the Pyrovile in "The Fires of Pompeii." At the time, Capaldi played a sculpture by the name of Lucius Caeceilius. The actor later appeared as another character in Torchwood. Now, viewers may finally understand how the three characters are linked.

"With regards to my Roman alter-ego, there will be a... he may appear again," Capaldi during an edition of Apple's Meet the Filmmaker (via Doctor Who TV) "He will certainly be invoked."

The series will most likely utilize the theory Davies came up with following Capaldi's stint on Torchwood.

"I remember Russell [T Davies] told me that he had a big old plan as to why there were two Peter Capaldi's in the Who universe: one in Pompeii and one in Torchwood," showrunner Steven Moffat told Nerd3. When I cast Peter and Russell got in touch to say how pleased he was, I said, 'Okay, what was your theory and does it still work?" and he said, 'Yes it does. Here it is...'"

Doctor Who will return to BBC and BBC America this fall. See a new promo below.