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, with the help of Mary Jane, must put a stop to the semi-liquid villain.

Mary Jane and Peter arrive in Niagara Falls for their postponed honeymoon, but it is soon interrupted when Hydro-Man returns and kidnaps Mary Jane.

Peter is shocked by Mary Jane's new powers, so they seek Curt Connors' help in figuring everything out. Mary Jane tells them about a dream she's been having, which may be a clue to her disappearance. But Hydro-Man finds them and kidnaps her again.