The Tenth Doctor meets one of his previous incarnations.
Did You Know?
The Fifth Doctor's costume was put together through various sources. The coat and trousers were originals taken from a Doctor Who exhibit. The original jumper had faded so a new one was knitted for the show. The hat was a new panama hat with an original hat band added. The trousers used in the special had extra fabric sewn in the bottom, having been altered for Colin Baker
when he briefly wore the costume during his debut as the Doctor. See more
Oh brilliant. I mean totally wrong. Big emergency. Universe goes bang in five minutes but, brilliant.