Donald’s new job at the scientific research center is terribly boring. From the nightly work as a cleaner he gets so tired that he goes to sleep inside a strange capsule. The next morning, the research team hectically makes preparations for the launch of a newly developed time machine. The experiment works and the capsule lands 65 million years ago in a wild landscape. Donald finally wakes up, only to find himself among dinosaurs. Trying to escape from a tyrannosaurus, he hurries back to the time machine which, alas, has already been retrieved by the researchers. Much to their surprise, the scientists find out that the time voyage was manned and feverishly try to get Donald back to the present.