Night of the Octopod - S2.E7

An octopod machine comes out of a flying saucer and threatens a rocket base near Niagara Falls. Superman dumps the octopod into the water and destroys the space ship that brought it to Earth. Unfortunate, an electric eel re-activates the Octopod and it emerges from the water and attacks a nearby power station. Superman comes to the rescue again and dispatches the Octopod once and for all.