- "That doesn't look good. She's taken a lot of damage."
- —Johnston noticing the damage report of the USG Ishimura.
Johnston was the first crew member of the USG Kellion to be killed by a Necromorph. A Slasher snuck up from behind and decapitated him. His primary weapon was a SWS Motorized Pulse Rifle, but Johnston never had the chance to effectively use the weapon.
By the time Isaac Clarke returned to the Flight Lounge to prepare the Kellion for launch, Johnston's corpse had already vanished along with Chen's, suggesting he had been transformed into a Necromorph.
- Corporal Johnston was possibly named after Antony Johnston, one of the writers of Dead Space and also the writer of Dead Space (Comic), Dead Space: Extraction, Dead Space: Extraction (comics), Dead Space: Salvage and Dead Space: Ignition.
- Dead Space takes place three years before the events of Dead Space 2.