Inept local police officer, Sergeant O'Brien and his sickly son Michael are the  human characters who most frequently make an appearance in The Mad Cows animated TV series. Wherever the cows travel in their bus, O'Brien and son seem to be there too. They are usually accompanied by their 'trusty' police sheep, Liam. The trio travel around in their ancient wreck of a Renault 4 police car.

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