Warhammer 40k fluff thread VI: They see me Ward'en, they haten

[Brother Oni]

Out of curiosity, was Space Hulk the earliest instance of the Genestealers as antagonists, or does their Rogue Trader mention also lists stats as well?

I remember there was an After Action Report in the front of the 1st Ed rule book detailing how much of a complete [redacted] the Blood Angel's first encounter with 'stealers aboard a Space Hulk was, but I'm fairly sure the actual missions of the game was set ~600 years later.

There was a background book as well, which also listed the first time an Imperial world was lost to a genestealer cult infiltration and planetary revolt.

Edit: According to a copy of the manual I found on the internet, the AAR is apparently dated 989.M41. I need to find my copy of the game to verify this, because it sounds far too recent to match up with the M35 initial date of contact.