When Arnold is in trouble for putting his goldfish in Mr. Drummond's hot tub, Willis insists that it is wrong to convict him without a trial. The whole family, with Mrs. Garrett as judge, comes up with an important verdict.
Arnold réclame justice pour Abraham, son poisson rouge, qui selon lui, a un aquarium trop petit. M. Drummond le retrouvera bientôt dans son jacuzzi. Un "procès" équitable va alors commencer...
Arnold ha gettato il pesce rosso nella vasca del signor Drummond e ora e' nei guai. Ma Willis convince la famiglia che non e' giusto condannarlo senza processo.