

Milo and his friends crash a party thrown for the Mayor's daughter, Debbie Bledsoe, and they cause the Debbie's new locket to be tossed into the sewer. The zaftig Helga goes after the gift and gets lodged in the pipe, plugging it up like a human cork. The hill people and rescuers work feverishly to rescue... the locket, and leave Helga blocking the main water line -- just one flush away from the great beyond. Helga causes a disruption in the water supply to valley, but the hill people pay no attention -- until their water is cut off too.
After learning that one more expense and the family will lose their medical coverage, Bob futilely urges the family to be extra careful. Milo finally manages to get himself enrolled in public school, where he meets and falls in love with a very unique student.
Milo soon grows attached to a stray Scottie dog the Oblongs take in, but the pet brings out the animal in the hyperactive boy, and the family gives the pooch away to Bob's boss, George, thinking he'll have a good home. But when his new owners soon tire of him, Scottie finds himself in an animal testing lab, sniffing perfume with narcoleptic side effects. So the Oblongs set out to rescue Scottie before it's too late.