Which BBC radio series made C.S. Lewis widely known as a Christian broadcaster?

Broadcast Talks made C.S. Lewis widely known as a Christian broadcaster.

The BBC commissioned Lewis to deliver a series of radio talks during the Second World War. The talks were broadcast in several installments between 1941 and 1944 and addressed basic Christian beliefs in language intended for a broad audience rather than only theologians.

Lewis later revised and collected the material in book form. The series was published under changing titles, including The Case for Christianity, Christian Behaviour, and Beyond Personality; the collected volume became Mere Christianity. Those later book titles are therefore related to the broadcasts but are not the original series title.

The programs helped transform Lewis from an Oxford literary scholar into a nationally recognized public Christian writer. Their wartime setting and accessible style contributed substantially to his reputation in Britain.