The Shakespeare code is a great episode for the third series! it shows Martha's first trip in the Tardis.they go back to 1599 to find Shakespeare being possessed by witches to try and open some kind of portal by using one of his plays that he's just written. This episode is good , it had some goofs like when they were relating to 'back to the future' , but they also had some bits where it also had some seriousness like when the doctor was wondering if rose could figure out the mystery if she was with him.(also when the witch crept up on the doctor in the prison cell it kinda made me jump!!! David Tennant you rock as the doc!!!!!!!