Blue Bolt Weird Tales #118

A flying saucer lands in the Everglades and alien creature Tagona emerges. He kills various people who stumble across his presence. Tagona is confronted by swamp hermit Zeek, who reveals himself to be Tagona's enemy Zafara Zaran, emperor of Arcturus, who banished Tagona 3,000 years earlier. Tagona kills Zafara but before he dies the old man says his descendants will take up the hunt until Tagona is destroyed.