Greenbeck was a big male otter in Rab Streambattle's Southsward otter crew. Fiercely loyal to Gael Squirrelking, Greenbeck helped the crew protect Queen Serena and her son Truffen and could always be counted on to use his large body as a shield. Together with Iris Streambattle, he faced the Dirgecallers as they were ready to close in on the squirrel refugees.