Why, exactly, melting trash using geothermal energy and storing it safely in the Earth's mantle
is a bad idea is never addressed.
Meg Ryan voiced the mad scientist Dr. Blight, while Tim Curry played her sentient computer sidekick, MAL. Captain Planet had so much talent they shuffled Tim friggin' Curry off to be a damn sidekick to a bad guy! This wasn't a one-time thing he did after being kidnapped by the producers in his driveway, either. Tim Curry has 26 episodes of Captain Planet under his belt.
No amount of voice modulation can hide that much Tim Curryness.