This is based on Cthulhu short stories by H.P. Lovecraft, an early-20th century American writer. These stories depict a certain scary monster dubbed by Lovecraft as the Cthulhu, which is the "Thing That Should Not Be.".
The specific story by H.P. Lovecraft that this song references is The Shadow Over Innsmouth. Written in 1936, it was Lovecraft's only story that was released as a book when he was alive. His other short stories were published during his lifetime in a magazine called Weird Tales.
The 1984 Metallica song "The Call Of Ktulu" is also based on H.P. Lovecraft's works.
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