In The Tomb of the Cybermen ( 1967 ) , veins were visible through the circular head of the Cyberman Controller and in Attack of the Cybermen ( 1985 ) and `` The Age of Steel '' ( 2006 ) , the Cyber-Controller 's brain is visible through the dome . In The Tomb of the Cybermen ( 1967 ) , veins and brains were visible through the domed head of the Cyberman Controller and similarly , in Attack of the Cybermen ( 1985 ) and `` The Age of Steel '' ( 2006 ) , the Cyber-Controller 's brain is visible through the dome .