Grinder is a big hammerhead shark that plays a big role in Riptide United. He ends up becoming a Riptide leader along with Striiker and Silversun against the Jurassic Horde. After watching Kendra and Silversun be eaten by Grimkahn, Grinder swam away back to Gray and Riptide Shiver. Later on, after fighting many Jurassics off with Striiker, Grimkahn raced out of nowhere and tore Grinder in half. His last words were "Never give up"
kind of shark: hammerhead
Fate: killed by Grimkahn