 Davies cast Julian Bleach to portray Davros after his performances in his Olivier Award @-@ winning play Shockheaded Peter and as the Ghostmaker in the Torchwood episode " From Out of the Rain " . To keep the return of Davros secret , the character was referred to as " The Enemy " or " Dave [ Ross ] " among the crew and was kept anonymous on the shooting scripts as much as possible ; however , the Radio Times called the secret " one of the worst @-@ kept ... in television history " . David Tennant liked Davros ' " Hitlerian megalomaniac " attitude and the nostalgic feeling he created — Tennant 's first memory of Doctor Who was Davros ' debut in Genesis of the Daleks — and described himself as being " absolutely captivated by [ the ] extraordinary creature " . To prepare for his role , Bleach reviewed Genesis of the Daleks , one of his favourite serials , to remind himself of Davros ' voice . Bleach described his interpretation of Davros as that of " [ a ] twisted megalomaniac , [ a ] mad scientist , [ and a ] misguided genius " at the same time and described the character as a whole as " a cross between Hitler and Stephen Hawking " whose " nihilistic desires " made the character " extraordinary " . Bleach would later use the German leader 's oratorical skills and his " dogmatic speeches " as a reference point . 
