Ecco the Dolphin

Ecco the Dolphin is an action-adventure game developed by Ed Annunziata and Novotrade International and published by Sega for the Mega Drive/Genesis in 1992. Versions for the Sega CD, Master System, and Game Gear were released the following years. It is the first installment in the Ecco the Dolphin video game franchise. The player character is a bottlenose dolphin who travels through time to combat hostile extraterrestrials in Earth's oceans and on an alien spacecraft. Ecco the Dolphin received favourable reviews and became a bestseller on the Genesis.