Achtung! Cthulhu 2d20: Operation Ultimatum (FREE PDF)

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Foil a Bizarre Alien Experiment!

Welcome to Operation Ultimatum, a one-hour introductory mission to help showcase Achtung! Cthulhu and the 2d20 system. Whether you’re new to roleplaying games, or just new to the rip-roaring pulp adventures of the Secret War, this mission has been specially designed to be fun and accessible— and provide the perfect introduction to Achtung! Cthulhu 2d20.

It is May 1940, and as the British Expeditionary Force is pushed inexorably back towards Dunkirk by the German Army’s Blitzkrieg, Professor Guilbert Paschal goes missing. Paschal is carrying rare and valuable occult artefacts and research materials, and his loss would be a disaster, so Section M, Britain’s occult special force, dispatches a crack team of agents to retrieve the missing academic. 

Initially the agents must follow the professor’s tracks seeking evidence and clues to his whereabouts, before encountering Nachtwölfe, the Night Wolves, a Nazi occult faction obsessed with strange science and weird technology. The trail eventually leads to the ruins of an ancient castle and a showdown with the malevolent Mi-Go, a strange insectoid-fungoid race, who hail from beyond Pluto. 

Will your agents survive this perilous encounter and live to fight another day? Find out in Operation Ultimatum! 


  • A single mission designed to be played in an hour 
  • Ideal for demos, conventions, and as a showcase for the Achtung! Cthulhu 2d20 system 
  • Uses the FREE QuickStart’s rules, with a step-by-step guide to mechanics 
  • Comes with four pre-generated characters so you can just pick up and play
  • Includes a map, playing aids, and illustrations!

    Requires the Achtung! Cthulhu 2d20 Quickstart to run.

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