Nail from Universe 7 is a Namekian warrior who fused with his father and brothers to defeat the demon known as Freeza.
In Universe 7, Nail was convinced by Grand Elder Guru to fuse with him in order to defeat Freeza and save their people. However, despite being able to kill several of Freeza's henchmen (including Dodoria) and land a kick to Freeza's face, Nail was quickly outmatched by Freeza once he'd transformed into his second form. After recovering from the battle, Nail encountered the elder of the village Freeza and his men had terrorized earlier and they agreed to fuse all of the people of Namek together into one being in order to defeat Freeza. This being became Gast Carcolh.