In ufology, a "Close Encounter of the Seventh Kind" (CE7) is a controversial, expanded classification referring to the creation of a human/alien hybrid, often through sexual reproduction or artificial scientific methods.

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Key Aspects of the 7th Kind (CE7):

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• Definition: It often implies the breeding of human and alien beings, sometimes referred to as the creation of "hybrids".

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• Context: While the first four kinds (sighting, physical evidence, entity, abduction) are widely discussed, the fifth, sixth, and seventh kinds are considered by many to be more speculative or sensationalized additions to the original UFO encounter classification system.

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• Differentiation: It is distinct from the 4th kind (abduction) and 5th kind (voluntary bilateral contact) by focusing on the creation of hybrid offspring, as indicated in various popular culture and paranormal accounts.

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​​​​An expansion to the classification created by astronomer Dr. J. Allen Hynek, a technical advisor on UFO studies, to categorize experiences by increasing closeness.