Josie acts like Madam Curie to explain how she discovered radiation and how it works. Beakman talks about how the fission of atoms produces heat, which makes radioactive materials glow. Beakman sets up a demonstration with mousetraps and ping pong balls (atoms) where he hits one and it causes a chain reaction of all of the mouse traps triggering.
Duke Nukem is overflowing with a radioactive charge, to the point where Captain Planet cannot get near him. However, Captain Planet has an idea to borrow the lead suit from Duke's very own assistant, "Lead Suit". Upon doing so, he is able to block Nukem's radiation with the protection of the suit.
Gaia warns the planeteers of unsafe nuclear practices that threaten the Earth and what a world polluted with nuclear radiation would look like. Gi and Linka discuss the harmful properties of nuclear radiation on human bodies.
Victor Hess tests his own hypothesis of cosmic radiation by using a hot air balloon and checking the radiation in the atmosphere. He noticed that it did indeed increase as he traveled higher up in the air.