''The Green Odyssey'' is an uproarious, hell-bent adventure story, combining fantasy, imagination and science, with a liberal dash of humor. It is in the best tradition of adventure science fiction, a swashbuckling tale of a resourceful spaceman who is, however, uneasily aware that he may have been miscast. Fortunately, he has the assistance of a large, gorgeous, energetic and adoring female who is supremely confident of his ability to handle all comers. With her help, that is. Alan Green was not exactly a hero. In fact he liked peace just as well as the next man. Not that he was really afraid of that crazy, hot-blooded hound-dog Alzo, or even of the hound''s gorgeous owner, the Duchess Zuni-who was also hot-blooded (to say nothing of the Duke). After all, these things were understood on this backward, violent planet, and a man could manage, provided he was alert twenty-four hours a day.
