Dumas is alone in Costello's office when a girl offers him a thousand dollars to take her father, the famous scientist Klaus von Hermann, to his hotel. Dumas accepts the appointment but von Hermann is killed in front of the hotel. The scientist was working in Libya at a gas to use against ozone layers hole and he had instead dicovered a very poisonous gas. Before dieing he puts the secret formula in Costello's jacket. So Extralarge becames a moving target for everyone interested in a mass killing formula.