Wesley is a little boy who lives in Thneedville. He glows by swimming in the polluted toxic water in the opening.
- It is thought that there is so much waste from manufacturing plastic trees and such, that it escaped into the water (that Wesley swam in) that he was irradiated and started glowing.
- In the real world, this is not possible due to the skin made of cells and you can not make cells glow. Also, Wesley would have died or gotten sick from swimming in the contaminated water.