Randomly trawling Google images - found this awesome picture Jackson Lake, Rosita, the Mark Gatiss Doctor, and the Shalka Doctor standing in for Doctors 1-3 in a famous scene from THE FIVE DOCTORS. 
Mark Gatiss: should be the Doctor in more things. Or the Master. Either or both. Everyone played by Mark Gatiss! 

Randomly trawling Google images - found this awesome picture Jackson Lake, Rosita, the Mark Gatiss Doctor, and the Shalka Doctor standing in for Doctors 1-3 in a famous scene from THE FIVE DOCTORS. 

Mark Gatiss: should be the Doctor in more things. Or the Master. Either or both. Everyone played by Mark Gatiss!