Trevor Spacey is one of the main characters found in both Metal Slug 4 and Metal Slug Defense. As a Korean computer hardware technician, Trevor has received his first computer from his parents and completely understood the binary numbers and computer languages when he was a child. During his summer break from school, he usually worked on making anti-virus software for his home work over vacations. The programs are still using at his school to oppose growing threats from the entire network. His ability is to understand the programming language to make himself enabled and assigned to the scout regiment of the Regular Army, especially the Peregrine Falcons Squad due to his respect to Marco Rossi as his Sergeant rank. However, there are rumors about him that after the combat against Amadeus Syndicate, he's retired to his work for the Regular Army as a security programmer.