C.S. Lewis’s wartime BBC radio talk series later collected as The Case for Christianity was called Broadcast Talks. The BBC transmitted the talks in 1942, after Lewis had already gained attention for earlier broadcasts explaining Christian ideas to a general audience.
Broadcast Talks was the first printed form of material that eventually became part of Mere Christianity. Lewis revised the talks and later combined them with additional series. The changing titles can make the publication history difficult to follow, because the same developing project appeared under several names.
The 1942 broadcasts were designed for ordinary listeners during the Second World War. Lewis avoided specialized theological vocabulary where possible and argued from shared moral experience toward broader questions about God, human nature, and Christian belief.
The later sequence included Christian Behaviour and Beyond Personality. These were not separate authors’ works or unrelated books; they were stages in the publication history of the material. The final book, Mere Christianity, appeared in 1952 and became the title most readers now recognize.