What was the title of the 1940s BBC radio talks that became C.S. Lewis’s Mere Christianity?

The 1940s BBC radio talks that became C.S. Lewis’s Mere Christianity were titled Broadcast Talks. Lewis delivered the talks during the Second World War, and they were later revised and published in book form.

The material appeared in stages. The first group was published as The Case for Christianity in 1943, followed by Christian Behaviour in 1943 and Beyond Personality in 1944. These works were later brought together as Mere Christianity in 1952. The title refers to the shared core of Christian belief rather than to a particular denomination.

The broadcasts made Lewis widely known beyond university and literary circles. His direct radio style was designed for general listeners, not specialists. Because the collected book is much more famous than the original broadcasts, readers sometimes identify Mere Christianity as the original broadcast title. Broadcast Talks is the specific title associated with the first published collection of the radio material.