It is well known that trauma is re-enacted but the re-enactment of trauma poses many clinical challenges. This is partly because unresolved trauma is often dissociated and non-verbal. While the basic trauma response of `fight/flight/freeze’ is now familiar, less attention has been paid to the third of these and to dissociative responses in which what cannot be expressed in words is interpersonalised and enacted including in the therapy room. Many clinicians recognize that trauma is enacted in the lives of their clients but are less attuned to how it plays out within the therapy relationship itself. This session addresses the interface between complex trauma and dissociation, which is interpersonalised in the form of enactments which occur within - as well as outside - the therapy room and which can derail the therapy unless identified and addressed.