Conventional meaning:
Intervention theory is a term used in social studies and social policy to refer to the decision making problems of intervening effectively in a situation in order to secure desired outcomes.
Alien Intervention Theory:
Intervention theorists believe that alien beings intervened on Earth, terraforming everything from the planet’s environment to human beings. They have arrived at that radical assumption by analyzing evidence across a wide range of disciplines, trying to scientifically explain the origin of life on Earth.