The progressiveness of Green's character has been well received. Mike Fillis of "Cult Times" magazine praised the Andersons' decision to make a black character Cloudbase's "second-in-command", while "The Daily Telegraph" referred to the character as a "black defender of planet Earth". Kurt Barling, who wrote an obituary on Grant for "The Independent", described Green as "one of the first positive black fictional characters in children's television". He praised the way that Grant delivered the character's lines, stating that his "mellifluous tones" gave Green a "serene and heroic quality". The authors of "The Rough Guide To Cult TV" argue that the casting of Green as a main character in the original "Captain Scarlet" was a result of shifting "TV politics" during the 1960s, pointing out that Gerry Anderson had been frustrated in his attempts to include prominent non-white characters in his earlier series.