Nere Hanson and her dolphins dive into perilous new adventures as she confronts dangerous shark mutates and savage Wasp, Whitey and Sham deep in the Twilight Zone. Tobin, Dai and even Cam return as Nere and her friends fight to save our planet from climate change and the insane scientist who wants to stop them. Along the way, Nere must also decide if she's finally ready to risk her heart.