Stuart was an unhappy young man who was in Sergeant Paterson's defence classes in Perivale in 1989. He was transported to the Cheetah World by a Kitling on the orders of the Tremas Master.
Later, when Ace was about to be killed by a Cheetah Person named Karra, he distracted it by running away. He wasn't fast enough to outrun the cheetah and was killed. The Cheetah person carried his body away as Ace looked on. (TV: Survival)