Overcoming fears of being caught, Bill and Jeff move the humans from the warpath of General Urko and his army. Will the two be able to help the people get to a new home before Urko catches up to them?

During an archeological dig on an ancient ruin, Cornelius uncovers an ancient, human-made book entitled 'A Day at the Zoo'. Needless to say, the images and words inside could lead to much trouble for man and ape alike....