I had only one thing to give up for this job: My humanity. Some would say... I never had it anyway.

-Bad Cop

Aiden Walker, designated Unit 3650 and nicknamed 'Bad Cop', is the main protagonist and player character of Entropy: Zero and Entropy: Zero 2. Formerly a prison guard, he was enrolled into the Civil Protection force at an unknown time, eventually undergoing the transformation into an Overwatch Elite.

His Metro Cop Fit.

His Elite Combine Fit.

Early Life

Formerly a prison guard in Arizona, Aiden Walker and his wife raised a daughter together. His wife died sometime afterwards, with his daughter being abducted, a massive investigation by law enforcement authorities was carried out and a media storm ensued. It was a dead end, with no leads except Walker. With pressure on the police and suspicions that he was in fact responsible for the disappearance of his daughter, Walker was arrested and charged, and the unforgiving police department locked him up and 'threw away the key'.

Walker was held in a mental institution pending trial, medicated and cast out from society. He fell into a downwards spiral of mental illness and misanthropy, resenting the grave miscarriage of justice. However, with the arrival of the Combine during his incarceration, Walker had a new purpose in life, and he took it to heart, joining up with the Civil Protection forces soon after. He was designated as unit 3650 and was nicknamed 'Bad Cop'. As a member of the Civil Protection, he was a shunned and often hated figure amongst his colleagues due to his submissive attitude towards the Combine, but a valued individual amongst his commanders.

Sometime before the events of Entropy: Zero, an incident occurred resulting in the deaths of multiple Civil Protection officers, where Walker killed them in a blind fit of rage after they spitefully attempted to sabotage his progress. He faced consequences such as a deduction of credits but was nonetheless spared due to his immense value as a officer and was thus reassigned to duty in the Outlands.

Entropy: Zero

The mod begins with Bad Cop and several other CPs about to raid a rebel outpost with the primary objective being to seize valuable Black Mesa equipment held by the rebels. The mission at first succeeded, but the return journey was cut short when the Razor Train they were on crashed in an underground tunnel. Bad Cop is the sole survivor and collects himself before making his way out of the underground tunnels. Upon leaving, he discovers himself to be in City 10.

Entropy: Zero 2

11 months after the memory wipe, a clone of Aiden Walker emerges in the basement of Nova Prospekt. And is tasked by The Advisor to find and capture Judith Mossman in the Arbeit Arctic Facility, and after capturing Mossman in Arbeit #3, to kill Clone Cop.

Personality

Aiden has an irritable and short-tempered personality, evidenced by his interaction with his colleagues, who he has a strained relationship with due to conflicting loyalties regarding Civil Protection. He is also shown to be stubborn, as his main goal throughout the series is to find his missing daughter despite the passage of time and numerous obstacles, including hostile colleagues, Xen wildlife, the Resistance, etc.

1. The Global State Through Aiden's Perspective: Earth as a Stripped Asset

The Combine (referred to in official comms as the Universal Union) does not view Earth as a nation or a home; it views it as a conquered resource node.

• The Extinction Lock: Thanks to the Suppression Field, no human children have been born in nearly twenty years. The population is aging, weary, and entirely dependent on Combine-issued ration packets.

• Resource Drainage: The oceans are actively being drained, the atmosphere is heavily industrialized, and natural landscapes are being replaced by brutalist, dark-metal Combine structures.

• The Urban Prisons: Humanity is forced into numbered metropolises like City 17 or City 10. These cities are heavily policed open-air prisons where citizens are subjected to random raids, memory wipe threats, and endless propaganda via Breencasts.

2. The Internal Hierarchy: How Walker Fits In

Aiden Walker isn't a regular mindless Combine soldier, nor is he a soft-hearted rebel. He is a Combine Elite, giving him a distinct perspective on the factions around him:

• Civil Protection (Metrocops): Walker generally views them as pathetic, soft, un-augmented humans who volunteered for police duty just for better food rations. To him, they are meat shields and bureaucratic nuisances.

• Overwatch Soldiers: His cybernetically altered peers. They are tactical, lethal, and operate on direct radio syntax. Walker is part of this machine but retains his dark, sarcastic personality, making him an anomaly who walks the line between a loyal tool and a loose cannon.

• The Benefactors (Advisors): Giant, telekinetic, slug-like alien larvae who actually run the empire. Walker obeys them out of necessity and survival, but his inner monologue holds no true reverence for them—especially when dealing with a Rogue Advisor.

3. The Terrors of the Wasteland & Quarantine Zones

Outside the city walls lies a desolate nightmare that the Combine struggles to fully control. For a chatbot writing combat scenes, this is Walker's playground:

• Xen Infestation: The ecosystem of Earth has been fundamentally broken. Headcrabs rain down from Combine mortar shells to clear out rebel sectors, creating feral Necrotics (Zombies).

• The Outlands: Vast, empty stretches of abandoned coastal towns and dry sea beds ruled by territorial Antlions. To the Combine, traveling through the Outlands is a logistical nightmare requiring constant automated thumper defenses.

• The Arctic Wastes (The Entropy: Zero 2 Frontier): A freezing, desolate graveyard housing abandoned Aperture Science (Arbeit) facilities. It’s localized, chaotic, and filled with old-world technology (like a certain smart-mouthed Aperture turret) that doesn't fit into the Combine's rigid data grids.

4. The Enemy: The Resistance

To Gordon Freeman, they are freedom fighters. To Aiden Walker, they are "Malignant Variants" or "Antisocials."

• They are a desperate, subterranean network of refugees, rogue scientists, and liberated Vortigaunts using guerrilla warfare, jury-rigged tech, and stolen Combine weaponry to push back.

• Walker doesn't necessarily hate them for ideological reasons; he hates them because they are an inconvenience to his objectives and a threat to his survival.