This discussion addresses the importance of fear as a key feature of attachment, examining some of the implications of Slade’s argument both for clinical work and for understanding of developmental process. The discussion also is focused on the kinds of genetic and evolutionary theories most useful in thinking about interactive effects, namely epigenetics, the study of genes in context. Finally the discussion identifies relational theory, which focuses on fear as an implicit dimension of attachment. Bromberg’s work on dissociation is cited as an example of work in which fear plays a prominent role.