WARNING: THIS POST CONTAINS SPOILERS!
A show source said: “They don’t have a big part to play, but fans will love to see them return and they are trying to help Matt in an hour of need.
“It is a humorous scene and it opens the door to any of them if they wanted to come back and do some more filming in the future.”
Executive Producer, Steven Moffat also said his intention was to include Nazi dictator Adolf Hitler in the next episode for comedy value.
He said: “Hitler is iconic – in an evil and ghastly way.
“In Indiana Jones and the Last Crusade there was a brilliant gag where Indiana Jones accidentally gets Hitler’s autograph.
“I think if you really want to p*** off Hitler you don’t make him into an icon of evil, you take the mickey out of him, make him a joke, make him be punched by Rory.”