Super Friends (1973)

S1E16 The Watermen

A mysterious spacecraft makes an emergency landing on Earth after a meteor strikes its fuel tank. To try and get back to the planet Sagittarius, the ship starts collecting silicon from seawater for fuel. However, aliens from the water planet begin to siphon off the silicon from Earth's oceans, leading to ecological disruption and causing a red tide that results in famine for marine life.