History
While being controlled by the Puppet Master, the Sub-Mariner employed a Hypno-Fish to kidnap the Invisible Girl and bring her back to his underwater villa. After using a Mento-Fish to mentally compel the Invisible Girl to meet him at a New York pier, Namor had the Hypno-Fish place her under its spell. He then had it surround Sue with an air bubble, and commanded it to bring her with him back to his base. [1]
Powers and Abilities
Powers
The Hypno-Fish possessed the ability to stun people with a hypnotic spell by looking at them with its single eye. In addition to living underwater, it could hover while outside of water, and could generate an air bubble around a fully-grown adult and carry them underwater with it