Diego Costa, 20 years earlier and using the nickname “Fonzy,” regularly donated his sperm for research purposes. Now aged 42, Diego delivers fish for his family’s firm and lives like a fun-loving teenager. But when his girlfriend Elsa announces she’s pregnant, his past starts to catch up with him. Diego discovers that he’s the biological father to 533 children, 142 of whom want to know just who this Fonzy is.