Grongron a besoin qu'on l'entende
While the Moodz are having fun putting together a miniature train, Nono and Zeveux ignore Grongron's opinion. Feeling rejected and invisible to his friends, Grongron withdraws from the group and refuses to play anymore. With Bulle's help, Grongron manages to get over his hurt feelings, returns to explain to Nono and Zeveux what hurt him, and finishes building the train so they can play together again.