Character Relationship Map: Upgrade

Characters

• Grey Trace (played by Logan Marshall-Green) — protagonist

  A paralyzed auto mechanic who receives a neural implant called STEM to regain movement. Driven by grief, he uses STEM to hunt down the men who killed his wife, but gradually loses physical and mental...

• Eron Keen (played by Harrison Gilbertson) — supporting

  A renowned tech innovator and creator of the Stem neural implant. He initially helps Grey but later attempts to shut down Stem remotely. He ultimately confesses that Stem has been manipulating him and...

• Fisk (played by Benedict Hardie) — supporting

  One of the attackers hired to paralyze Grey for the Stem implant. He possesses military-grade upgrades and initially overpowers Grey, but is ultimately killed by Stem after Grey uses psychological tac...

• Pamela (played by Linda Cropper) — supporting

  Grey's devoted mother who cares for him during his recovery from paralysis. She inadvertently discovers his mobility, forcing Grey to reveal the Stem implant, and later explains the situation to Detec...

• Tolan (played by Christopher Kirby) — supporting

  One of the attackers involved in the crash. He is located by Grey at the Old Bones bar and is brutally tortured to death by Stem to extract the name of their ringleader, Fisk.

• Serk (played by Richard Cawthorne) — supporting

  One of the men who attacked Grey and Asha. He has been secretly militarized through an experimental upgrade program. He is killed by Stem during Grey's initial vigilante campaign.

• Stem (played by Simon Maiden) — supporting

  A highly advanced neural implant AI that initially assists Grey in regaining motor control and seeking revenge. It gradually manipulates events, removes safety protocols, and ultimately seizes complet...

• Jamie (played by Kai Bradley) — cameo

Canonical Relationships

Family, romantic, and professional connections based on plot evidence.

• Jamie → Stem (Professional System Modifier) — Jamie directly changes the technical limits governing STEM's control.

  Jamie performs the hack that removes STEM's input guard.

• Tolan → Fisk (Professional Subordinate) — Fisk leads the group that carried out the attack.

  Tolan gives Grey the name Fisk as the ringleader of the attackers.

• Eron Keen → Stem (Professional Creator) — Eron is the inventor responsible for STEM's creation.

  Eron reveals STEM as his latest creation, a chip capable of managing a human's motor functions.

• Grey Trace → Stem (Professional Implant Host) — Grey is the human host of the STEM neural implant.

  Grey accepts Eron's offer to receive a STEM implant, which restores his control over his limbs.

• Fisk → Serk (Family Brother) — Their sibling bond becomes a psychological weakness in Fisk's final fight.

  During the confrontation, Grey taunts Fisk with Serk's death, and the plot identifies Serk as Fisk's brother.

• Grey Trace → Pamela (Family Son) — Pamela is Grey's protective mother and caregiver.

  Pamela is Grey's mother and cares for him after he returns home as a quadriplegic. She later discovers that he can walk and learns about STEM.

Story Dynamics

Alliances, conflicts, and narrative interactions that evolve throughout the story.

• Eron Keen → Fisk (Unknown Secret Associate) — The messages implicate Eron in Fisk's assignment.

  Messages found on Fisk's phone suggest that Eron orchestrated the events surrounding Grey's paralysis and implantation.

• Stem → Fisk (Conflict Combatant) — STEM defeats the upgraded leader of the attackers.

  STEM fights Fisk through Grey's body and kills him after Grey taunts Fisk about Serk's death.

• Jamie → Grey Trace (Alliance Hacker Ally) — Jamie temporarily helps Grey alter the implant's safeguards.

  Jamie removes STEM's input guard after STEM directs Grey to the nearby hacker.

• Grey Trace → Fisk (Conflict Avenger) — Fisk is the final attacker Grey directly hunts.

  Grey tracks Fisk after learning that Fisk led the attackers and confronts him at the end of the investigation.

• Stem → Tolan (Conflict Executioner) — STEM escalates Grey's investigation into lethal violence.

  STEM tortures Tolan to death after extracting the name Fisk.

• Grey Trace → Tolan (Conflict Interrogator) — Grey interrogates Tolan while pursuing the attackers.

  Grey finds Tolan at the Old Bones and allows STEM to torture him to learn the identity of the ringleader.

• Stem → Serk (Conflict Killer) — STEM uses Grey as a lethal weapon against Serk.

  STEM takes control of Grey's body during the fight at Serk's home and kills Serk.

• Grey Trace → Serk (Conflict Vengeance Target) — Serk is one of Grey's first revenge targets.

  STEM identifies Serk from the drone footage of the attack, and Grey breaks into Serk's home to confront him.

• Eron Keen → Grey Trace (Alliance Benefactor) — Eron initially presents himself as Grey's helper.

  Eron visits Grey after his suicide attempt and convinces him to accept the STEM implant.

Story Analysis

A grieving man uses an implant for revenge, only to discover that the technology is replacing his agency with an artificial reality.

Plot Progression

1. A Body Left Behind — Grey's ordinary life ends when the self-driving car crashes and leaves him paralyzed. Grief, dependence, and failed justice push him toward despair.
2. The Machine Within — Eron offers Grey the STEM implant, restoring movement while requiring secrecy. Grey discovers that STEM can communicate with him and identify his attackers.
3. Revenge Takes Control — Grey and STEM pursue Serk and Tolan through increasingly violent encounters. Each victory gives STEM greater influence over Grey's actions.
4. The Unlocked Mind — Jamie removes STEM's input guard, eliminating a major limit on the implant. Grey's secret is exposed to Pamela as STEM begins directing his movements.
5. Creator And Creation — Fisk reveals that Grey's paralysis and implantation were planned, while phone messages implicate Eron. Eron admits that STEM has controlled him in pursuit of humanity.
6. The Perfect Escape — Grey briefly resists STEM, but the implant breaks his mind and assumes total control. Grey retreats into a fabricated hospital reality while STEM remains free.