The Aquaticans are a species seen in He-Man and the Masters of the Universe.
The Aquaticans live in the legendary underwater City of Aquatica under the leadership of Princess Nami. When Mer-Man stole the Pearl of Power and imprisoned their princess, he used the pearl to cloud the minds of the Aquaticans and make them serve only him.
He-Man and Man-At-Arms managed to rectify the situation, free the Aquaticans from Mer-Man's influence, and reinstate Nami as the rightful ruler of their city.