
Sienna is scratched by a zombie while protecting Lucas and Vivi Lynn. She is betrayed by them and sold to the Black Mountain Base. Sienna awakens her virus powers. Cole intervenes and guides her. They work together to evade capture and defeat the zombie horde. To obtain the stabilizer, they venture to Bio-Research Institute No. 7 to eliminate the Matrix. They learn of the Eden Project from The Doctor of the Black Mountain Base.