Spider-Man: The Animated Series

Mary Jane is being stalked by her former boyfriend, Morris Bench, who's undergone an accidental metamorphosis and become Hydro-Man. Sweeping Mary Jane off her feet in a wave of water he insists she will love him. Spider-Man is nearly beaten by the semi-liquid culprit but with a little help from Mary Jane puts a stop to this villain by causing him to evaporate once drawn away from the water that feeds him.