The Ecco the Dolphin games can be divided into two distinct storylines: the Mega Drive/Genesis games (Ecco the Dolphin, Ecco: The Tides of Time, and Ecco Jr.) and the Dreamcast game (Ecco the Dolphin: Defender of the Future).
Two six-part comic book series of Ecco the Dolphin stories based on the first game were featured in Sonic the Comic.