Plague Inc. Wiki
Plague Inc. Wiki

Welcome to Hellmouth is an achievement and combo in Plague Inc. It is unlocked by getting a combo by evolving Lair, and then evolving Shadow Portal in the Shadow Plague.


  • Interestingly, the player does not need to actually place a Lair in any country in order to unlock this achievement.
  • This achievement is a reference to Buffy the Vampire Slayer, a show about killing vampires and other creatures.