Who Played Him? David Morrissey When Did He Appear? The 2008 Christmas Special The Next Doctor Even though he was partly used as a cheap ratings grab like the Regeneration that spawned the Meta-Crisis Doctor was, Jackson Lake still proved to be a very likeable and engaging character. The Tenth Doctor investigating who he is and why he thinks hes the Doctor is a great narrative thread in a mediocre episode and he actually makes a great companion. Especially since hes gradually built up as a character in his own right while most alternate Doctors bear a large number of similarities to the established Doctors. While the Jackson Lake Doctor does bear a few similarities to the Tenth Doctor, his persona literally being a combination of everything the Cybermen know about the Doctor helps to create something new, which allows for a relatively fresh take on the Doctor. Morrissey did such a great job playing this faux-Doctor that Im continually hoping that he really will be the next Doctor.