The phrase "alien menace" refers to a perceived threat or danger posed by beings from outer space. It suggests that these aliens could be harmful or pose a risk to humanity or the world. Full definition
All the while, a powerful alien menace is threatening to destroy the galaxy once again. (heavy.com)
The International League of Super Reviewers is a group dedicated to defending the earth against alien menaces and super-villains by writing superior b (goodreads.com)
More will be revealed in coming months about this terrifying alien menace as humanity's relationship with the Thargoids evolves throughout Elite Dangerous 2.3 and 2.4, bringing a new dynamic to the Elite Dangerous galaxy. (pcgamer.com)