The XDF series are the main fighters from Earth Defense Force and it's remake, Super Earth Defense Force. There are two fighters, XDF-1 and XDF-2, although besides looks are completely identical. They hold two pods that can go through three levels of "evolution" that enables them to have different formations. An additional evolution is gotten at levels 3 and 5. Weapons also upgrade per level up to 5. The pods are able to block some enemy shots and also have ramming damage. When the pods are in a formation, their firepower is split in half and the XDF shoots a weak shot.