Are you super familiar with Warcraft lore? Can you name all the dragon aspects, what they were created for, where they got their powers? Do you have a working definition of the Dragon Soul, what it is, what its other name is, and why it's important? Do you know who Sinestra was before she was a torn-up, reanimated corpse in the bottom of the Bastion of Twilight? Are you related to the Red Shirt Guy? Are you the Red Shirt Guy? Then this post is likely not for you.
But if you've been running the Raid Finder like a fiend, killing dragons and elementals and minions left and right, and suddenly found yourself wondering why, exactly, you were fighting in Wyrmrest Temple, this is for you. If you're wondering why Thrall is suddenly pals with the Dragon Aspects, this is for you. If you're wondering why exactly Deathwing is such a huge major threat and what's with all this running around you have to do, this one is for you.
Let's take a quick sweep through the entirety of Cataclysm and recap what's happened. Better yet, let's sum up.