Just in case you’re confused, that is ANOTHER doctor, with all of the real doctor’s memories and knowledge except he’s a human, not a Timelord.(only one heart). He and Rose Tyler, last time we see them, are kissing and will grow old together. He does get clothing on, don’t worry. 🙂 yes this happens. I swear. That’s the most of him they ever show while he has no clothes on. I’m slightly confused too.