 The former theme shares many traits with hostile occupation fiction, but the invaders tend to view the occupied peoples as students or equals rather than subjects and slaves.The latter theme of secret watcher is a paternalistic/maternalistic theme.In this fiction, the aliens intervene in human affairs to prevent them from destroying themselves, such as Klaatu and Gort in "The Day the Earth Stood Still" warning the leaders of Earth to abandon their warlike ways and join other space-faring civilizations else that they will destroy themselves or be destroyed by their interstellar union.