Hydro-Man is Morris Bench. He is an enemy of Spider-Man and the Fantastic Four.
He was a sailor. One day, he tripped and fell into the water, alonmg with several barrels of radioactive waste. This mutated him, turning him into a man made of water. This caused him to go insane and become the villain Hydro-Man.
He can control and absorb water.
He is a member of the Frightful Four, a group dedicated to kill the Fantastic Four.