Trouble is brewing under the sea! The Sea Riders are an elite team that patrols Oceana and keeps it safe. Narissa wants to join more than anything. But she's not the only one! To earn a spot at the Sea Rider Academy, Narissa must win an epic sea horse race against some very tough competitors -- including nasty sea nymph Tempestua. Only Narissa's never ridden a sea horse before. Now it's time for her to sink or swim!