Just watching 'Crack in the World'...I might have missed the references before, but Inferno ripped this off big time, right? Professor (Sorenson, appears in Planet of Evil as nomenclature later of course) with hand infected and covered up, working with his young female assistant, other love interest/tension - she ends up with Sutton in Inferno and the younger scientist in the film, even the magma shots look the same from Inferno's title sequences...maybe I've gone mad haha...