Skrulls

A lone Skrull soldier is not the greatest threat, but this encounter has Heroes facing a whole squad of them! The Skrulls act in unison, with all of them moving, attacking, and adding Thugs and Civilians when every Master Plan card is played. Their Overflow effect may take back the progress the Heroes have made on a Mission, or deal unpreventable damage. Infiltrating society in unpredictable ways, the Skrulls are constantly turning all Civilians around them into Thugs, or all Thugs into Civilians.

Their Threats give them the extra protection of infiltrated Super-Skrulls and advanced Skrull technology that can deal extra damage to Heroes. Making the Heroes’ task even harder, some Threats establish all Thugs and Civilians around them as Skrulls, making them impossible to rescue or defeat until those Threats are cleared. Once the Heroes have finally managed to complete 2 Missions, they must take down each Skrull in a single powerful attack, as damage to them doesn’t carry over from turn to turn. This will require careful coordination (or particularly lethal superpowers).

https://www.kickstarter.com/projects/cmon/marvel-united-multiverse/posts/3719014