C.S. Lewis’s 1941 BBC radio-talk series was called Broadcast Talks.
Lewis delivered the first series of his wartime BBC talks in 1941 under the title Broadcast Talks. He later delivered additional series, including Christian Behaviour in 1942 and Beyond Personality in 1944. The talks were eventually revised and collected as Mere Christianity, published in book form in 1952.
The broadcasts were designed for a general audience during the Second World War. Lewis presented shared Christian ideas rather than arguing for one particular denomination. His clear, conversational style helped make him widely known beyond Oxford’s academic world.
The title Mere Christianity belongs to the later collected book, so it is not the original name of the first radio series. The Case for Christianity was also a title used for a later American publication connected with the broadcast material. These related titles are why the original 1941 program name is easy to overlook.