This was achieved by having Patrick Troughton respond to his pre-recorded ... So, she mixes up as many solvents as she can find in the moonbase sickbay, pours the ‘Polly Cocktail’ into ...

The TARDIS arrives in 2070 on the Moon, where a weather control station under the command of a man named Hobson is in the grip of a plague epidemic — in reality the result of an alien poison ...