Tai is sick of being broke. It's time to make money - without having to work too hard for it. He decides to become the apprentice of Marcus, a 1980s business guru and slimy sea ghost. Marcus reckons he knows all there is to know about making big money. With the café in trouble, Robbo and Megan decide to trust Tai and Marcus to sort things out. Tai's so busy getting flash with the cash that he starts selling smoothies to sea ghosts, and their invisible money isn't worth much. Can Tai turn things around and stop Paradise Café going bust? Meanwhile, Ragnar tells Chloe to identify the Sea Born by offering them a special fruit. Can she afford to fail her master again?