Seven is a giant Pacific octopus (who got his name because he only had 7 tentacles at the time) that Martin accidentally finds when he hits the Creature Power Suits, which fell into the ocean. Seven then slipped into the Power Suits, and accidentally absorbed the DNA of a walrus, a great white shark, a bowhead whale, and an Atka mackerel, which made him a vicious sea monstrosity. The mutation wore off when Martin touched the deactivation button, reverting Seven back to normal.