This paper is concerned with the presence of Malebranche in the young Foucault, in particular with the notion of the World in the interpretation of the Classical Epoch presented in the 1954-1955 course, The Anthropological Question. He also outlines the themes of the possible secondary doctoral thesis on Malebranche as a psychologist that Foucault imagined around the same time. Subsequently, he discusses the reasons for the abandonment of Malebranche, a decade later when the problematic of the World was replaced by that of the episteme.