Resident Evil Zero explores the origins of the Mansion Incident with a dual‑protagonist system, letting players swap between Rebecca Chambers and Billy Coen to solve puzzles and survive.
- Developer/Publisher: Capcom / Capcom
- Release: 2002 on Nintendo GameCube; later HD remaster on multiple platforms
- Genre: Survival horror
- Notable: Partner Zapping system to switch between characters in real time, no item boxes with item dropping mechanic, Ecliptic Express opening scenario, classic pre-rendered backgrounds and tank controls
- Reception: Generally positive reception for atmosphere and mechanics; appreciated by series fans for fleshing out backstory and offering a unique dual-character twist