Ellen Gordon, a New York executive's mistress falls for the executive's young business associate when the young man is accidentally sent to use the apartment where the executive and his mistress get together every Wednesday. More complications arise when the executive's wife shows up with plans to redecorate the apartment.

While making his nightly rounds in the neighborhood, Patti's pet cat D.C. finds himself the carrier of a call for help from a kidnap victim. Patti enlists skeptical law enforcement help to find the victim before it's too late.

Herbie, the Volkswagen Beetle with a mind of its own, is racing in the Monte Carlo Rally. But thieves have hidden a cache of stolen diamonds in Herbie's gas tank, and are now trying to get them back.

Frederick Bolton has to solve two problems. First, his boss has instructed him to come up with a reasonable campaign to promote a new product, a stomach pill named "Aspercel" - by tomorrow. The second problem is Fred's daugther, Helen. She is absolutely fond of horses, takes riding classes and has already had decent success in some competitions. Her biggest wish is to own a horse herself, a dream her father cannot afford at all. Now Fred tries to solve both problems at once by simply combining them: A horse named "Aspercel", ridden by his daugther should bring the name of the pill into the papers and make Helen happy, too. But there's still one more obstacle: Helen and Aspercel of course have to win a few prices to make this idea work...

The inimitable VW Beetle is losing all his races and destined for the scrap heap until mechanic Hank takes him over and gives him a new lease of life. Soon, Herbie is winning again, to the fury of his previous owner, who builds a menacing black bug to challenge Herbie to the ultimate race.

A young woman suspects foul play when her cat comes home wearing a wristwatch. Convincing the FBI, though, and catching the bad guys is tougher than she imagined.

Wilby Daniels, a successful lawyer running for District Attorney, suddenly finds himself being transformed into an English sheepdog. Somehow he has to keep his change a secret and find just what is causing it, all the while eluding the local dog catcher.

Professor Dooley takes home a duck from his research laboratory as a toy for his son, but soon finds out that it lays golden eggs.