 Also evident throughout the swamp are numerous indicators of pollution, which Pickett believes are connected to pesticide use on the island plantation.After Clint Crockett (Adam Roarke) accidentally tips over Smith's canoe, he and his sister Karen (Joan van Ark) escort Smith to the family mansion where he meets the entire Crockett family.The grouchy, wheelchair-bound family patriarch Jason (Ray Milland) intends on spending the next day enjoying both the 4th of July and his own birthday celebrations uninterrupted.