The BBC has admitted it made a mistake by telling people that Christopher Eccleston was quitting Doctor Who so soon after the first episode.
Lots of fans were upset to hear the actor did not want to make the second series, just a few days after the popular sci-fi show came back on TV.
The BBC admitted it had agreed with Christopher the information would not be made public so quickly.
In other Doctor Who news, comedian Simon Pegg is to star as a villain.
The BBC also released a quote from Christopher, claiming he had said he hoped viewers "continued to enjoy the series," but it's now admitted it did not consult him about that statement.
Various actors are said to be up for the job of taking over from Christopher, and one of the favourites is David Tenant.
'Dream come true'
Comedian Simon Pegg has revealed he is going to be in episode seven of the current series. He'll play a nasty character called The Editor, who's in charge of a building which time travellers can't return from.
He said: "I'm in one episode of the new Doctor Who. I think it's going to be spectacular. It's a real honour to be in it. To be a Doctor Who villain was a bit of a dream come true, so I was very happy to do that."