Elvis was Dominic Greene's cousin who was rescued from the streets by Greene, thus ensuring Elvis' undying loyalty as Greene's bodyguard.
Elvis is seen accompanying his boss throughout the film, including when Camille Montes is reintroduced to Luiz Medrano, and when James Bond interrupts a meeting of Quantum board members at a performance of the opera Tosca in Austria. He appears alongside Greene at a fundraising party held by Greene in Bolivia, where MI6 agent Strawberry Fields trips him down a flight of steps, injuring his neck and revealing that Elvis wears a hairpiece.
Elvis is with Greene when he meets with General Medrano at the Perla de las Dunas hotel in the Atacama Desert, now wearing a neckbrace. When Greene is departing, Bond arrives at the hotel and begins a shootout with Greene's men, killing several of them, including Greene's driver. Greene and Elvis run back into the hotel, where Greene positions Elvis facing a doorway, ready to shoot whoever comes through. However, a fire has started in the garage below, causing one of the hotel's many unstable fuel cells to explode and incinerate Elvis.