The Simpson family return home from church. Lisa goes up to her room removes her church hat, her footwear and socks. Then heads towards the beach on her own. While there she finds 40 shells. Just then Milhouse arrives. He tells Lisa that a 1000 fish get caught in plastic rings each year. Then Lisa goes into the water, swims for a few metres ( barefoot in her church outfit) then she goes under. While underwater she rescues 58 fish from plastic rings. Over the next few weeks Lisa returns to the sea from time to time saving fish from plastic rings and disposing of plastic rings.