Spider-Man (1981)

Wrath of the Sub-Mariner (1x24)

:

Upon calling a truce with crime lords Silvermane, Hammerhead and Caesar Cicero, the Kingpin shows them a powerful acid developed by Dr. Everett to unite the crime lords in a plot to pull off crimes. The subsequent chemical waste from the new chemical is illegally dumping into the water, causing sickness to Sub-Mariner's cousin, Namorita. He takes her to the nearest doctor Dr. Donald Blake, then begins to wreak havoc on the surface world.