In Venture, Platyagons will spawn mostly in Hell, but sometimes they can spawn in the normal world. If it detects a human, it will fly up to them and breath fire, probably killing them. Platyagons are immune to fire and lava, but are twicely damaged by snowballs.
In Venturian Battle, they serve as antagonists, supporting St. George as he invades Flakerot. However, they are weak to cider, as their patron saint, St. George is too.