Cook's comedy partnership with Dudley Moore led to "Not Only... But Also". This was originally intended by the BBC as a vehicle for Moore's music, but Moore invited Cook to write sketches and appear with him. Using few props, they created dry, absurd television that proved hugely popular and lasted for three series between 1965 and 1970. Cook played characters such as Sir Arthur Streeb-Greebling and the two men created their Pete and Dud alter egos. Other sketches included "Superthunderstingcar", a parody of the Gerry Anderson marionette TV shows, and Cook's pastiche of 1960s trendy arts documentaries – satirised in a parodic segment on Greta Garbo.