Growth is a mutant/human/cryptid hybrid. Growth is plant-like in appearance. In cryptozoology he is known as the Tree Beast of Utah. Growth can shoot a green liquid out of the palms of his hands. If this liquid hits a human mortal the effects of it can be devastating. The only exception is Master Beast. Growth confronted Beast as his human form, and hosed him with the liquid. This blast gave him powers and abilities. Ever since then, Beast has tried to track Growth down.