Extra Terrestrial is a strain name used within cultivation and collector communities to describe a pale, visually striking Psilocybe cubensis isolate associated with strong, immersive psychedelic effects. While there is no peer-reviewed mycological record establishing Extra Terrestrial as a formally defined genetic lineage, the name appears across vendor listings and grower discussions—often alongside variants such as Albino Extra Terrestrial (AET) or Extra Terrestrial of the 4th Kind (ET4K).

Extra Terrestrial functions as a boutique cultivar label, emphasizing a ghostly aesthetic, pronounced blue bruising, and an experience characterized as expansive and “cosmic.” As with many modern cubensis names, it likely represents a stabilized phenotype or isolation selected for appearance and experiential qualities rather than a single, universally documented parentage. Its popularity stems from the combination of otherworldly looks and a potent, cerebral trip profile that appeals to experienced users.