<Li> Stage: Seven Keys to Doomsday (filmed regeneration sequence)--16 December 1974--7 January 1975 </Li> <Li> Television: The Five Doctors--23 November 1983 </Li> <Li> Stage: Doctor Who--The Ultimate Adventure--23 March--3 June 1989 </Li> <Li> Radio: The Paradise of Death--27 August--24 September 1993 </Li>

How many doctor who doctors are still alive