Your first Extreme Metal album(s)

Venom - Black Metal and Onslaught - The Force were my first two extreme metal albums.

Edit: If Metallica are extreme metal then RtL and MoP were my first two. I don't really regard them as extreme metal though.
 
I remember listening to Altars Of Madness by Morbid Angel when I first started getting into extreme metal, but it was most likely some shitty band that was a small step up from Metalcore.
 
Venom is pretty much Motorhead with occult lyrics. I love both bands btw so I'm not bashing haha.
 
First heart-pumping Metal song I heard was Master of Puppets being played at a school Battle of The Bands, at that point the most extreme thing I'd listened to was Wolfmother :P But the first album I listened to that was even remotely hard metal was Rob Zombie's Hellbilly Deluxe - thanks to The Matrix. And if you're talking extreme-extreme, then the first was almost definitely Slayer (last year) - I remember thinking it was absolute shit - that that's where I was drawing the line, and now I'm checking out Death/Black/Harder Thrash in the "Ass-Kicking Albums" thread.
 
I think it was Death's "The Sound Of Perseverance". I found it when I was looking for the song Painkiller on youtube and I noticed the Death cover so I decided to check it out.
 
De Mysteriis Dom Sathanas - Mayhem
Still among my favorite albums of all time, maybe even my very favorite. Practically every single song is a classic on this album.
 
My friend's dad listened to Thrash mostly so I heard a lot of Metallica, Slayer some Maiden and Priest when I was really young (I got babysat there).
Around 8 or so I found a college radio station Lock 88.1, they played metal at various times, that's when I started hearing stuff like Cannibal Corpse, Deicide, Morbid Angel and Sepultura it's also where I first heard Mercyful Fate and King Diamond Napalm Death.. the list goes on and on.

The first extreme metal I bought was Amorphis' Tales, At The Gates' TRITSIO, and Hypocrisy The Fourth Dimension, all from a Best Buy!
 
The first metal song that I ever HEARD (listened to with an open mind rather than unwittingly casting it off before the track hits the :10 mark) was Lost Wisdom by Burzum. It was the song that not only turned me onto metal, but to music in general. Varg's undead howl struck a chord deep within me that has never ceased ringing; a lifelong fascination with the grotesque and the macabre (I slept with a Crypt Keeper doll from ages 4 to 8)

But the first extreme metal album I ever truly listened to in its entirety was one that has since remained in a nearly unparallel canon; Symbolic. This was a turning point in my musical evolution no less significant than that legendary initial shriek that instantly shattered my perception of the potential of sonic art and also my testicles. This was a revelatory instance in which metal shed its childish status of momentary spark of primal ecstasy and assumed a form far more evolved; a coherent, entirely unpretentious odyssey into untapped regions of the blackness of consciousness.

Although I was fortunate enough to experience my personal heavy metal epiphanies in the elite company of Chuck and Varg, I still stumbled through my fair share of the genre's rougher patches (Dimmu Borgir, Arch Enemy) before discovering my own thematic niche (Haemorrhage, Frightmare etc.)
 
I was already into metal thansk to my older brother but it was mostly mainstream stuff, Maiden, Priest, Def Leppard, Saxon when i got into my ealry teens i started getting into thrash, death and hardcore my first albums were bought off a guy selling his vinyl:
Sepultura - Beneath the remains, Suicidal Tendencies - lights, camera, revolution, Testament - Practice what you preach,
 
My first extreme metal album was Most definitely Haunted by Six Feet Under. Bought it in 95 because I thought the cover looked cool and I was eight so that's all that mattered to me hahaha I still have it laying around somewhere... Haven't listened to it for definitely more than 10 years. It was a good starting point but I'm not a fan of the obituary style anymore and that's exactly what that was. Chris Barnes vocals were still good back then though hahaha