User blog comment:J1coupe/Battle of the Doctors. Epic Rap Battles of History./@comment-86.162.172.84-20140106225853

Maybe... First Doctor raps normally then whens hes finished, he collapses and starts dying of old age, while hes dying the second doctor comes in, when second finishes, first regenerates, disappears then second holds his head and starts hearing voices, while second is being forced to change, third comes in etc.