Marvel-ous

• The "X" (Gulo gulo) also referred to as glutton, carcajou, skunk bear, or quickhatch, is the largest land-dwelling species of the family Mustelidae (weasels).
• "X" is a stocky and muscular carnivore, more closely resembling a small bear than other mustelids.
•  The "X" has a reputation for ferocity and strength out of proportion to its size, with the documented ability to kill prey many times larger than itself.
• The "X" can be found primarily in remote reaches of the Northern boreal forests and subarctic and alpine tundra of the Northern Hemisphere, with the greatest numbers in northern Canada, the U.S. state of Alaska, the Nordic countries of Europe, and throughout western Russia and Siberia.
• The US state of Michigan is, by tradition, known as "the "X" State", and the University of Michigan takes the "X" as its mascot.

ID "X"

Answer (highlight to read) : Wolverine