Jack Williamson

Brother to Demons, Brother to Gods begins with a genetic engineering program conceived by the Smithwicks, a family of "Creators" who first improve on inadequate Homo sap ("preman") with two laboratory species and then come up with the "stargods." These powerful Frankenstein fabrications, however, send the Creators …

Darker Than You Think by Jack Williamson, originally a novelette, was expanded into novel length and published by Fantasy Press in 1948. The short version was published Unknown in 1940. It was notably reprinted by UK-based Orion Books in 2003 as volume 38 of their Fantasy Masterworks series. It can be classed as …