AMAZING SPIDER-MAN (1963) #212

Hydro-Man’s first appearance! During a New York City heatwave, Morris Bench is transformed into a being of water. Hydro-Man blames Spider-Man for this phenomenon, and he’s traveling through sewers, hoses, sinks, and showers to find the wall-crawler responsible! Spider-Man vs. his most unusual villain yet! The Coming of Hydroman!… Notes Features the Hostess Fruit Pies ad, Captain America In « Fury Unleashed! » Mary Jo Duffy’s assistant editor credit taken from letters page header.