Doctor Who fans got a cosmic treat on Wednesday when TV bosses revealed they were planning a second series.
The series came back to BBC1 on Saturday night and attracted a whopping 10.5 million viewers.
The show, which stars Christopher Eccleston as the Doctor, and Billie Piper as his assistant Rose, is all about their time-travelling adventures.
A BBC boss said she could not confirm if Chris and Billie would be in it, but they would be talking to them about it.
"I think Chris is fantastic as Doctor Who. But we've still got another 12 episodes to go," said the BBC's Jane Tranter. "People will have to wait and see what happens."
There will be a second 13-part series and a Christmas special.
Doctor Who writer Russell T Davies said: "It's fantastic news."