"Howard the Duck" was actually based on a Marvel comic book character of the same name. Unfortunately, the sarcastic cigar-puffing duck was cheaply made as a tiny rubber costume in the film. Even so, it remains a cult classic.
The story goes something like this: a scientific experiment somehow lulls poor Howard to Earth. With some help from Leah Thompson, Howard the Duck ruins the diabolic plans of Jeffrey Jones (doesn't this guy ever play a good guy?) and saves the day.