|First Appearance:||The Ambassadors of Death|
|Portrayed by:||Ronald Allen|
Ralph Cornish was head of Space Centre and controlled all movements astronomically. He was the main communicator for Recovery 7 and communicated with both Charles Van Lyden for the first time and the Doctor for the second.
He began to believe the Doctor almost immediately after Bruno Taltalian was found guilty of sabotaging the computers. He allowed UNIT personnel to use his facilities as a staging ground for security and had help from Brigadier Lethbridge-Stewart. He agreed to send the Doctor up into space to find the astronauts within Mars Probe 7. He was angered when General Carrington automatically force-handedly took control of the Centre in order to broadcast the Alien Ambassador across the world. Cornish failed to restrain the officer and he was arrested by the security guards.
He was later released after Carrington was taken away by UNIT.