Little did brothers Joey and Bobby Johnson know that their attempt to go fishing the first day of their summer vacation would take them on an environmental adventure they'd never forget. Finding their neighborhood pond covered with green muck and dead fish, the brothers set out to "do something" about it. That leads to a close encounter with a manatee, a tour of a center that rehabilitates injured sea turtles, and the creation of "The Greenies." Join Joey, Bobby and their kid sister Katy who find out even kids can help protect our environment - and have fun while doing it!