6. The Meta-Crisis Doctor & The DoctorDonna
Who Played Them? David Tennant and Catherine Tate
When Did They Appear? The Series 4 finale Journeys End These two are really love it or hate it Doctors with some fans loving that there were two David Tennants onscreen and that Donna was finally able to save the universe in a big way while other fans found that they were too much of a deus ex machina. And while their climatic scene is exciting enough, I personally dont feel that these characters work very well. Their biggest flaw is that they dont seem like characters in their own right and just feel like direct copies of the Tenth Doctor without any specific character traits of their own. Some of Donnas mannerisms are retained but her overall personality seems to be overtaken by the Doctors until shes just a mouthier Tenth Doctor. Having said that though, her final scene has a pretty big emotional impact even if it was a bit of a cheat since wed been promised someone would die. And lets not even get into what happened to the Meta-Crisis Doctor.