End of the World (1977 film)

End of the World is a 1977 American film directed by John Hayes.

When he and his wife Sue Lyon decide to investigate the source of the signals, they end up being held captive in a convent thats been infiltrated by aliens. These invaders plan to destroy the world with the natural disasters. As the human, Father Pergado and alien leader Zindar Christopher Lee explain the Earth is a hotbed of disease that cannot be permitted to continue polluting the galaxy.

Source: Wikipedia