Welcome to Santa’s grotto, little fishes, please come in, and meet the real-life Santa Klaus, it’s really, really him! Deep beneath the shimmering blue sea, it’s almost Christmas Eve, and Shelly the shark is very excited. She puts on her Santa suit and turns her cave into a festive Christmas grotto. Then she waits for all the little fishes to come in. They seem strangely reluctant…But Sid the squid thinks all his Christmases have come at once! Will Sid get taken in by Shark’s Santa disguise – or will he be in for a big surprise? A hilarious underwater Christmas romp from the creators of ‘Mince Spies’.