Gradually, the multiverse hypothesis has been gaining popularity, not only in the scientific and academic sphere, but also in popular culture. This hypothesis, however, is not recent; Thomas Aquinas himself had to respond to a version of it. Although the problem is broad and must be approached in an interdisciplinary dialogue, the Thomistic approach is very interesting, since he accepts the plurality of worlds as something possible but denies that it is a possibility made real. His answer, which is the subject of this article, is an opportunity to think about our representation of God and his causal activity.