Captain Jack has an American accent. They are British because the TARDIS translates the language into what the companion/viewers understand. When translating to English, the default accent is British, for some reason.
[ This is so adorable! If we have a son, this would be a great cosplay idea. -Jen ] Doctor Who - Are You My Mummy? OMG If only I had a little boy I would have totally made my husband dress up as the doctor and him as that little boy!