George Scribner was selected as the director, and he was later teamed with Ralph Zondag as co-director. Storyboard artist Floyd Norman stated that Scribner envisioned the film "to be more than just a struggle for survival. He wanted this dinosaur movie to have elements of fun and humor...Our director wanted to explore the fun elements of dinosaurs, such as their size, shape, and texture. George also knew that since dinosaurs come in all sizes—what wacky relationships might I come up with? What funny situations might plague a critter of such massive size?" Scribner left the project to work at Walt Disney Imagineering, and Eric Leighton was brought in as co-director. The new script had an "Iguanodon" named Noah as the protagonist wandering with his grandparents and a lemur companion named Adam, and a group of "Carnotaurus" as well as a rival "Iguanodon" named Cain playing the antagonists. The story dealt with Noah, who had the ability to see visions of the future, foreseeing the coming of an asteroid and struggling to guide a herd of other dinosaurs to safety. Further into production, Noah, Cain and Adam were renamed Aladar, Kron and Zini, and certain aspects of the story were altered further into what was later seen in the final product.