On a school sailing trip, fifteen youngsters of varying ages are inexplicably transported to a planet where dinosaurs still roam. They come across talking dinosaurs, rebels, pirates, a princess, and primitive scientists while seeking to return home. These unusual companions assist them in evading troops, robbers, dangerous dinosaurs, and crazy priests. Aggression between the two oldest lads causes a schism in the ranks and a devious double cross scheme. In this difficult environment, unlikely relationships emerge, and the gang discovers that each member has qualities that may help them go home if they work together. Losely based on Jules Verne's 1888 novel Deux Ans De Vacances.