 Late in 2016, Altus released a follow-up novel, "King Kong Vs. Tarzan".Early in 2020, "Tarzan, Conqueror of Mars" was released, in which John Carter oF Mars was revived.In October 2016, Altus Press released "Six Scarlet Scorpions", the first entry in a new spinoff series centering around Doc Savage's adventuress cousin, called "The Wild Adventures of Pat Savage".