Hailing from Corel, Barret swore revenge on ShinRa Inc. when his hometown was destroyed by their malfunctioning Mako Reactor. He lost his best friend, Dyne, his wife, Eleanor and in his right arm in the ensuing conflict; all that he had left was Marlene, Dyne's young daughter whom he adopted under his care. Barret formed AVALANCHE with Tifa, Jessie, Biggs and Wedge and fought against the ShinRa in Midgar by bombing their Mako Reactors.
Barret helped Tifa and Cloud rebuild the Seventh Heaven bar in Edge, but left soon after its opening to look for a new source of energy. On the last day before his departure, he spent the night talking with his precious daughter. He regularly called back to speak to Marlene, but only returned to Edge when Bahamut Sin was attacking the city to battle alongside his former comrades.