The bug-eyed monster (BEM) is an early convention of the science fiction genre.^[1] Extraterrestrials in science fiction of the 1930s were often described (or pictured on covers of pulp magazines) as grotesque creatures with huge, oversized or compound eyes and a lust for women, blood or general destruction.

In the contactee/abductee mythology, which grew up quickly beginning in 1952, the blond, blue-eyed, and friendly Nordic aliens of the 1950s were quickly replaced by small, unfriendly bug-eyed creatures, closely matching in many respects the pulp cover clichés of the 1930s which have remained the abductor norm since the 1960s.

This section may contain irrelevant references to popular culture. (March 2024)

• The Daleks from Doctor Who. When the show was created, the BBC producers stated that Doctor Who would be a "hard" science fiction show, and there would be no bug-eyed monsters – explicitly stated by show creator Sydney Newman. Writer Terry Nation created the Daleks in the show's second serial, much to Newman's disapproval.^[2]
• In "What Is This Thing Called Love?", Isaac Asimov's parody of both pulp fiction and the bug-eyed monster idea, a woman captured by aliens for the purposes of study keeps using the term when referring to her captor.
• In "The Gap Cycle" of books by Stephen R. Donaldson, the alien creatures are referred to by the main characters as BEMs.

• Insectoid