Is David Tennant now the first actor to play two incarnations of the Doctor?

Question

Did the Tenth Doctor go through a full-blown regeneration or not? Opinions?

Answer 1

i don't think he regenerated but simply let of some excess steam. However does Donna touching the bio matter and creating the second doctor with her DNA mean she and the Doctor had metaphysical s*x? After all they did create a new life form with both their DNAs?

Answer 2

Whether or not it "counts" as a full regeneration is still up in the air.  From Wiki: "Whether he has used up one of his regenerations is not explored; in Doctor Who Confidential for this episode, Tennant says he thinks this is up to future writers."

http://en.wikipedia.org/wiki/Tenth_Docto...

And as for the Duplicate... "It is left deliberately ambiguous as to whether the new Doctor is actually a new incarnation of the original Doctor (if not strictly speaking a new regeneration) or a copy."

http://tardis.wikia.com/wiki/Meta-Crisis...