First published in 1920, "The Metal Monster" is an Abraham Merritt fantasy novel and features the return of Dr. Goodwin, who first appeared in "The Moon Pool".

In a letter dated 6 March 1934, H. P, Lovecraft states that "The Metal Monster" "...contains the most remarkable presentation of the utterly alien and non-human that I have ever seen." The novel's exotic setting and extravagant scientific speculations make it a landmark of lost-race fantasy fiction.

This time, Dr. Goodwin is on a botanical expedition in the Himalayas. There he meets Dick Drake, the son of one of his old science acquaintances. They are witnesses of a strange aurora-like effect, but seemingly a deliberate one...