Backers have been begging for a Green Horde / Massive Darkness crossover since this campaign began. Fortunately, their cries have not gone unanswered and today a new add-on was announced.
For $13 this Optional Buy brings all of the retail characters introduced in the Zombicide: Green Horde Kickstarter campaign into Massive Darkness. It contains 64 cards converting 17 Heroes, 5 Mobs, 2 Agents, 7 Roaming Monsters, and 3 Familiars to use them in Massive Darkness. As this is not a Kickstarter Exclusive item, it does not include any of the Kickstarter Exclusive characters introduced in this campaign, and those will not be converted to Massive Darkness.