After separating from his wife, Leonard Parker (Cosby) quit the spy business and became a restaurateur. His wife refuses to speak with him, and his daughter, who changes her career more often than her clothes, has begun dating a man old enough to be Leonard's father! On top of it all, the government has asked him to come back and save the world again.

A scientific experiment unknowingly brings extraterrestrial life forms to the Earth through a laser beam. First is the cigar smoking drake Howard from the duck's planet. A few kids try to keep him from the greedy scientists and help him back to his planet. But then a much less friendly being arrives through the beam...