Snowman watches with great interest as Private Thompson has hallucinations while transforming into a zombie. Marroquín and Lucas go back to the rehab center without noticing that Cruz is spying on them. Marroquín passes out due to the gunshot wound that NoBalls gave him. Lucas is afraid his father might die. At a Mexican airport, Lilia gets ready for her journey to meet Marroquín for their interview. When Contreras intercepts her to threaten her, she convinces the airport police that the man is stalking her. Lilia gets on a plane without noticing that Scar is still following her. Across the border, Taft loses it with Romeo and threatens to shoot him, so Romeo reveals that the only person Marroquín trusts is his cousin, Dávila. On the secret military base, Snowman's experiments with the zombie soldier fail, and when Thompson frees himself, Valencia is forced to shoot him in order to save the scientist. Murdoch accepts getting more humans for Snowman's experiment and sends Valencia and two other Rangers on a secret mission to hunt illegal immigrants. In the rehab center, Lucas tells his father he saw other "monsters" on the drone's footage, so Marroquín orders Chainsaw to search the hills around the center. In a US airport, Dávila welcomes Lilia. When he discovers that Scar is following them, he ambushes the deadly agent and kills him. Neither of them realizes that Dávila's van is broken and about to leave them stranded in the desert. When the zombie herd led by Becerril finally emerges from the tunnel, they meet the other group led by Cruz. When the two zombie groups reunite, Becerril and Cruz engage in a savage zombie mating ritual.
—Amazon Studios