Finnian is a young guppy fish who has a snail as a best friend, called Lisa. Every morning they have an adventure, but one day they stray away from the safe path that Finnian's dad had made. They meet certain fish along the way, but meet an unfriendly neighbour who they wish they had never met.Join these two best friends from different backgrounds as they embark on an adventure, swimming and slithering through their neighbourhood, showing their individual strengths and looking out for each other along the way.