|Killzone: Liberation, Killzone 2|
Prof. Batton was a leading researcher in the weapons division of the ISA. She was chiefly responsible for the development of the self-guided tactical nuclear weapon codenamed 'Red Dust', as well as many other, less destructive weapons. Her work on Vekta was of vital importance in the arms race against the Helghast, and the ISA considers her one of its greatest assets in the region. Some of Evelyn's research was years ahead of that of her colleagues – not just the ones on Vekta, but throughout all of the United Colonial Nations’ colonies.
In Killzone: Liberation, she was a VIP that Templar needed to save in Rayhoven Base, and later on in a Helghast base where she was tortured for the ID codes needed to activate Red Dust and the other nuclear weapons stolen by the Helghast. Despite being part of the weapons development team, she was completely against Stratson's plan of using them on Vekta.
In Killzone 2, she accompanies Templar and Rico on the New Sun as mission support, and often coordinated with Alpha Squad. She discovers that that the Helghast were using petrusite, a dangerous mineral found only on Helghast, to power most of Pyrrhus’ defenses. She travelled with Alpha to the wastes as petrusite appeared to be heavily concentrated there and appeared to be connected to Helghast defenses.
Though the mission succeeded as they had discovered the petrusite power source, Garza had died in the process. Back on the New Sun, the Helghast unleashed a counterattack on the ISA fleet, and Evelyn coordinated with Templar to try and destroy the Pyrrhus’ connection to the petrusite. She is shot in the chest and killed personally by Colonel Mael Radec, when Jan Templar refuses to give up the codes during assault on the ISA cruiser New Sun.