CEO of a US drug company who travels to Bulgaria and becomes entangled in a violent revenge cycle. After being attacked, his damaged brain is replaced with tissue from Yegor, allowing Yegor's consciousness to merge with him. They team up to pursue Tatoya and Robo-Jackie. Despite initial cellular rejection, he ultimately defeats Tatoya, reconciles with Jackie, and later achieves permanent brain synchronization with Yegor.
Initially married couple whose relationship fractures due to infidelity and betrayal.
Tatoya is the primary antagonist who initiates the violent cycle against William.
William and Yegor form a symbiotic alliance after their brains are merged.
Dr. Ivanov performs the life-saving but biologically complex surgery on William.
Pavel supports the surgical team and handles the post-mortem repairs for William.
Local thugs misinterpret events and target William due to false rumors.
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