The protagonist Leon travels to the dark universe of Warhammer 40,000 and possesses the body of a dying Imperial soldier, Kane. In desperation, he activates the "Red Alert" system and obtains an MCV (Main Base Vehicle) that can be deployed into a base.

However, the initial units provided by the Red Alert system (such as Conscripts, GIs, and Grizzly Tanks) are vulnerable to Space Marines, Tyranids, and Chaos Daemons. In order to survive and thrive, Kane must utilize the unique advantages of the Red Alert system:

1. Asymmetric Warfare: Utilize Red Alert's rapid deployment, low-cost mass troop growth, and subterfuge tactics (such as engineer occupation and spy infiltration) to counter technologically superior enemies.

2. Core Advantage—Tiberium Crystals: The crystal seedlings provided by the system absorb the energy of the Warp and grow. Their radiation can purify and hinder the corruption of Chaos on a large scale, transforming desolate and deadly areas into "purification zones" and resource production areas. This "pure land" will become the foundation of his foothold in the dark universe.

3. Capture and Replication: The core feature. While Kane can't independently develop 40th-century technology, he can use his Psychic Control to capture enemy units (from Ork lads to Starships) and mass-produce them in a Replication Center. This allows him to continuously "copy" and absorb enemy technology, gradually expanding his own army. From replicating Orks and Tyranids to analyzing Imperial tanks and Space Marine power armor, he ultimately builds a powerful army that blends Red Alert's advanced technology with the might of 40th-century forces.

4. Strategic deterrence with superweapons: unlimited nuclear bombs, lightning storms, iron curtains, and teleportation