"Fresh out of Superhero School, Captain Green gets a call. Dolphin is tangled up in plastic, and there's trouble for Seagull and Turtle too. When our brave superhero rushes off to help, he finds himself on a major mission: saving sea creatures form plastic. Using his incredible power, Captain Green promises to save the day. But can he clean up this mess for good? Find out how you can be a hero too. Superpowers are not required; anyone can do it..." -- Back cover.

First published 2018.