A monster is something that deviates from the normal order of things. It manifests itself as a violation error or disorder in nature. This image of the monster is still preserved in modern biology. In modern biology monsters are associated with normality and stability. The normal form of life or the stability of the order preserved in life makes the monster an object of negation. Deleuze, on the other hand, determines the philosophy of difference as a project to liberate difference from its curse. This project also applies to monsters. In the ontology of difference, the monster is an anomaly, rather than an abnormality that assumes normality or a disorder that assumes order. This means that the monster like the organism is a variation of life that implies infinite variability. For Deleuze, this conception of life is found in the multiplicity. The multiplicity is Deleuze’s concept of auto-movement which was the classical characterization of life. In light of this, organisms and monsters are equally variants of the life-manifold. However this does not mean that there is no distinction between organisms and monsters. Organisms and monsters are formally distinct aspects of a living thing. All living things are organismic in some ways and monstrous in others. This ‘monstrosity’ corresponds to the virtual image of life. The answer that the ontology of difference gives to the problem of the Monster is that monstrosity is a virtual image that is formally distinct in living things.