From Nintendo: In this sequel to Ecco the Dolphin, everyone's favorite underwater hero must battle the Vortex Queen and her hive of drones. The wicked queen followed Ecco back to Earth from the future and quickly established her hive. It's up to Ecco to defeat this alien threat by navigating the depths of his side-scrolling world, solving puzzles and receiving help from his marine-mammal friends. When Ecco used the time machine to save his pod, he split the stream of time in two. He must now restore the rift before the world is permanently changed into a mechanical world, sucked dry by the Vortex.