ECCO THE DOLPHIN DEFENDER OF THE FUTURE (SEGA DREAMCAST DC)

Hundreds of years in the future, humanity and dolphins live peacefully together and share the land. Dolphins, far smarter than they appear, act as guardians of the Earth, as dolphins and humans explore the galaxy. An alien force, known as the Enemy, seeks to end this happy existence. The Enemy damages Earth's defense system and alters history for the worse. A dolphin extraordinaire, Ecco, must travel through time to set things right.

Ecco is a 3D underwater adventure game. There are over 25 aquatic environments to explore. Ecco must communicate with other ocean creatures and learn to manipulate his environment if he is to successfully defeat the Enemy.