The fungies are a species of colorful mushroom folk who existed long ago on prehistoric Earth. Their unique biology allows them to pop their limbs off and on, trade limbs, and even combine their bodies.

Their bustling town is home to Seth, a 10-year-old science lover who is fascinated by how the world works. Along with his artistic older brother Pascal, the two get into all kinds of trouble that is both hilarious and heartwarming.