Harry Thurston, a young chemical engineer accidentally compounded a formula to convert human flesh and blood into water. A huge container of this remarkable solution was spilled, and splashed over Bob Blake, Harry's friend, causing him to disintegrate and become pool of water on the laboratory floor. Promptly an antidote was concocted, and with the aid of this, Bob regained his natural form. He then discovered that he could control this phenomenal change merely by power of thought. He sometimes partnered with the young hero Rainbow Boy.