Munchkin: Warhammer 40.000 - Cults and Cogs

From Steve Jackson Games:

Munchkin Warhammer 40,000 returns with two more new Armies to add to your games! The Genestealer Cults manipulate DNA to infiltrate worlds . . . when you realize they're among you, it's already too late. Adeptus Mechanicus has a more straightforward approach, sending their soldiers in intricate mechanized armor to lay waste to everything that opposes them.

You need the core game "Munchkin Warhammer 40.000" to play with this expansion.