History

So Sam came back from hell, but with out his soul
Cas brought in a bunch of Leviathans from Purgatory
Uh, they lost Bobby
And then Cas and Dean got stuck in purgatory
Sam hit a dog
Uh, they met a prophet named Kevin
They lost him, too
Then Sam, underwent a series of trials in attempt to close the Gates of Hell
Which nearly cost him his life
And Dean-well Dean became a demon
A knight of Hell, actually

So Sally had a baby boy, Perseus
Azazel let him feed off him
Uh, they had to house a demon
And then Percy and Lucifer became one
He went to camp
They lost that demon
Then Sally, underwent a few deals in attempt to get her sons soul back from the Cage, which cost her life
And Percy-well Percy became a demigod
A hero of Olympus, actually