Phenomenon is the second Japanese studio album by MONSTA X. It was released on August 21, 2019 with "X-Phenomenon" as its main promotional track.
The album features the previous singles "Livin' It Up", "Shoot Out" and "Alligator", as well as their B-sides. "X-Phenomenon" was pre-released as a digital single on July 15. Then "Carry On" was released digitally on August 12.
The physical release comes in three editions: a regular CD edition and two limited CD+DVD editions (type A and type B). A box with all three editions was sold on Universal Music Japan shop.