Out in the middle of an African desert Swamp Thing discovers a tropical oasis that has suddenly appeared and should not exist. When he captures a tribesman and questions him explains that a man named "Seeder" created it. Unfortunately this jungle isn't supposed to exist so Swampy destroys it, then travels, via a sort of different dimension, to Metropolis. While in the City's Botanical Garden he comes across the villain Scarecrow, who is stealing some poisonous flowers. He gives Swamp Thing a dose of his toxin-and it causes him to go haywire and cause giant vines and plants to cover the city. Superman isn't happy-and the only way to stop the catastrophe is to burn him, which Supes does with his heat vision. It burns the toxin out and Swamp Thing regenerates. Before he leaves he asks the Man of Steel for some advice on how to wisely use his powers, then returns to Louisiana where he is greeted by a woman named Capucine, who wants his help. She's a thousand years old and wants help from the Avatar of the Green, which was promised long ago. In a flashback, which shows an earlier version of Swamp Thing, we find out the specifics of those events. Then, it's back to Swamp Thing finding "Seeder", who continues to mess up with the plant kingdom. In Scotland he creates a tree that produces whiskey, a substance that makes everyone who drinks it highly aggressive. And when John Constantine, who is investigating the place, drinks some, he's put under its influence and nearly destroys the Swamp Thing. But Swamp Thing manages to fight-and realize the true extent of his powers.
I found this collection interesting, as it continues to deal with the human scientist, Alec Holland, adjusting to now being the latest Swamp Thing-and how he must deal with all the memories he has from the previous Avatar (who was never a man but thought he was Alec Holland). Recommended.