Boss Monster: Crash Landing 5-6 Player Expansion - Rules of Play says:
Crash Landing expands the epic Boss Monster card game to 5-6 players and introduces a new set of science fiction-themed Bosses, Heroes, Spells, and an all new treasure type, the Alien Artifact. Will you play as one of the new alien Bosses, using technology and otherworldly monsters to lure in intrepid Explorers and slay them? Or will you play as one of the classic Bosses, using your spells and monstrous cunning to teach these alien upstarts who the baddest dude in the land is?