Delta Green is a horror Role Playing Game (RPG) published by Arc Dream Publishing. It sits at the intersection of government conspiracy, military action, and Lovecraftian cosmic horror. Characters are drawn from law enforcement, intelligence agencies, and the military — people who have seen things the world is not supposed to know exist, and who are quietly falling apart because of it.
If you want to feel what a Delta Green session is supposed to feel like before you run one, there is a particular strand of film that will do the job better than any amount of reading the rulebook.
The Setting and Its Roots in Call of Cthulhu
Delta Green grew out of Call of Cthulhu, the classic horror RPG published by Chaosium since 1981. Where Call of Cthulhu leans into the 1920s investigator aesthetic — libraries, expeditions, academics slowly losing their minds — Delta Green transplants that cosmic horror into the late twentieth and early twenty-first century. The monsters are the same. The universe remains indifferent. But now your investigators carry firearms, have security clearances, and operate in a world of plausible deniability and institutional decay.
The tone is bleaker. The wins are smaller. The cost is higher.
The Films
What follows is not a curated prestige list. These films vary enormously in budget, critical reception, and production quality. Some were theatrical releases, some went straight to DVD. None of them are comfortable watches. But each one, in its own way, captures something true about what a Delta Green scenario feels like from the inside.
The Keep (1983)
The Keep is the outlier on this list. Directed by Michael Mann, it had a genuine Hollywood budget, a strong cast including Ian McKellen and Gabriel Byrne, and an original score by Tangerine Dream. By the standards of the time it was a blockbuster-scale production, even if the finished film is famously troubled and difficult.
A Wehrmacht unit occupies a Romanian fortress during the Second World War and inadvertently releases something ancient. The film is visually striking, atmospheric, and ultimately too ambitious for its own good — but the atmosphere it conjures, of soldiers in an enclosed space encountering something that operates entirely outside their frame of reference, is pure Delta Green.
The unambiguous lesson from The Keep: military authority and firepower mean absolutely nothing when the threat you are facing does not share your ontology.
The Outpost Series
The Outpost films (2008–2013) are low-budget British horror films about mercenaries discovering a Nazi-era weapons experiment in a bunker in Eastern Europe. They are not subtle. They are not expensive. But they are efficient, and the scenario they present — small team, hostile environment, enemy that cannot be killed by conventional means — maps almost perfectly onto a Delta Green operational brief.
The sequels (Black Sun and Rise of the Spetsnaz) are diminishing returns in terms of craft, but the original holds up as a lean, effective piece of genre work.
Deathwatch (2002)
Deathwatch follows a British unit in the First World War who take a German trench and find something wrong with it. The geography of the trench seems to shift. The prisoners behave strangely. The soldiers begin to turn on each other.
This one is explicitly about the war itself as a kind of supernatural corruption, but the scenario structure is familiar: enclosed location, small group under pressure, escalating paranoia, losses that do not feel earned or meaningful. That last quality is particularly Delta Green. Characters die in Delta Green scenarios not because they were heroic or because the story demanded it, but because the universe is indifferent and they happened to be standing in the wrong place.
The Bunker (2001)
The Bunker is another World War II horror film — German soldiers trapped in a bunker, something in the tunnels beneath. It shares DNA with Deathwatch and the Outpost films but is quieter and more psychological. The horror is less explicit, the dread more sustained.
For Delta Green purposes, the useful thing about The Bunker is its focus on what confinement does to people who already have good reason to distrust each other. A Delta Green cell is rarely made up of people who fully trust one another. They share operational goals. They do not necessarily share everything else.
Dog Soldiers (2002)
Dog Soldiers is the best film on this list by some margin, and also the most technically optimistic — in the sense that the characters are genuinely competent and fight back effectively, even if it does not save them.
A British special forces unit on a training exercise in the Scottish Highlands encounters werewolves. That synopsis makes it sound lighter than it is. The film takes its soldiers seriously: they communicate, they adapt, they maintain unit cohesion under extreme pressure. What they cannot do is win, because the math does not work out.
That tension — competence meeting an impossible situation — is the core of Delta Green. Your agents are not amateurs. They are trained, experienced people. They still probably lose.
Devil’s Rock (2011)
Devil’s Rock is a New Zealand production set on the Channel Islands in 1944. Two New Zealand commandos discover a Nazi occult experiment in a German fortification on the eve of D-Day. A single creature, a confined space, a small cast.
It is the most direct analogue on this list to an actual Delta Green scenario. The scale is intimate, the lore is specific, and the film understands that the creature’s power is not just physical — it operates through manipulation, through desire, through the gaps in people’s resolve. That is how the Mythos works in Delta Green. It does not only try to kill you. It tries to change you.
What They Share
These films were made across four decades, in multiple countries, with wildly different budgets and intentions. What connects them is structural:
Small cast. None of these films have large ensemble casts. They focus on a small group — a unit, a team, a handful of survivors — which creates the intimacy and pressure that horror requires. Delta Green scenarios work the same way. The cell is small. Everyone in the room matters.
Enclosed location. A bunker, a trench, a farmhouse, a fortification. The characters cannot simply leave. Whether the confinement is physical, tactical, or situational, they are committed to the space. In Delta Green, this is often the moment the scenario begins in earnest — when the agents realise that extraction is not straightforward and the mission has changed shape.
Very limited win conditions. These films do not end with the monster defeated and everyone going home. The best outcome is usually that some people survive and the secret is contained. That is also a good Delta Green outcome. The scenarios are not designed for triumph. They are designed for endurance, for difficult choices, and for the kind of survival that leaves marks.
On Budget and Influence
The Keep is the only film here that was made with real money behind it. The others are low-budget productions made for specific, non-mainstream audiences. That is not a criticism. It is, in fact, part of why they work for this purpose.
Delta Green is not a mainstream game. It is not trying to be. Its players tend to be people who have been playing RPGs long enough to want something that takes the darkness seriously rather than treating it as backdrop. The films on this list were made for similar audiences — people who want their horror to mean something, who do not need the protagonist to win, who understand that the point is not the resolution but the experience of facing something genuinely terrible and seeing what it costs.
The Gouge is the closest contemporary equivalent in terms of budget profile: a targeted production for an audience that knows what it wants, not chasing mainstream theatrical success. That is the correct comparison. These are not films for everyone. Neither is Delta Green.
Running Delta Green
If you are preparing to run Delta Green for the first time, or preparing a new campaign, I would suggest watching at least two or three of these films before your first session. Not for specific plot ideas — though you may find those too — but for the feeling. The pacing. The way competent people talk to each other when things are going wrong. The way hope compresses and then disappears.
The rulebook tells you the mechanics. These films show you the atmosphere. Both are necessary.
The Delta Green core rulebook and Handler’s Guide are available from Arc Dream Publishing.