Doctor Who has picked up some top celebs on his space travels to star with him in the second series.
Tracy-Ann Oberman from EastEnders and Anthony Head from Buffy will appear as villains alongside David Tennant's Doctor and Billie Piper as Rose.
Tracy, who plays Chrissie Watts, will play an evil woman called Yvonne Hartman, and Anthony Head will play a scary headmaster.
Roger Lloyd-Pack, who's Trigger in Only Fools and Horses, will also guest star.
Roger is already mates with the new Doctor David Tennant as he plays his father in the fourth Harry Potter film. In Goblet of Fire, Roger plays Barty Crouch and David plays Barty Crouch Junior.
Roger will appear in the first two-parter of the series, which will be episodes five and six, when we also see the return of one of the Doctor's oldest enemies, the Cybermen.
Anthony Head will appear in episode three, alongside two other characters who've been brought back for this series.
They are Elisabeth Sladen who played one of the Doctor's old companions, Sarah Jane Smith, and K9 the robot dog. They starred with the fourth Doctor, played by Tom Baker in the 70s.
Thunderbirds star Sophia Myles will appear in episode four, and actress Pauline Collins will play Queen Victoria in episode two.
Doctor Who will be back on our screens for a Christmas special this year, and series two will start in 2006.