The aim of this essay is to extend a course charted over twenty years ago by the Reverend Professor C. F. D. Moule. My debt to him extends even to the title, derived as it is from his ‘The Intention of the Evangelists’. But more substantially, it was his independent thesis and insightful method which provided the stimulus for this study. Against the developing consensus, especially among continental scholars in the 1950s, that the gospel was a creative theological work designed to support or correct the beliefs of Christians, i.e. for those who were advanced in the faith, Professor Moule argued that Mark's aim was apologetic and evangelistic, focused upon the outsider who needed to know the essentials of the story. Even if Mark intended his gospel for Christians, it was written for believers engaged in evangelism to remind them of the facts on which the superstructure of their faith stood or fell.