The phenomenon of double retrograde vaporization (DRV) is explained on the basis of infinite-dilution critical phenomena. It is shown that the peculiar double-domed or inverse "S" shaped dew point curve distinctive of DRV arises from the conflicting requirements at infinite-dilute versus critical conditions. The argument is general and takes into account both classical and nonclassical behavior. The transitions from subcritical temperatures through double retrograde behavior to normal retrograde condensation at higher temperatures are also explained on the basis of infinite-dilution critical anomalies. The criterion for the existence of DRV is given based on the volumetric properties of the two phases in equilibrium.