Archangels are fierce. They are absolute.
They are Heaven's most terrifying weapon.
"That's right. The archangel Michael, with the flaming sword. The fighter of demons, holy force against evil."
"So they're not really the Hallmark card version that everybody thinks? They're fierce, right? Vigilant?"
"Well, I like to think of them as more loving than wrathful; but yes, a lot of Scripture paints angels as God's warriors. 'An angel of the Lord appeared to them, the glory of the Lord shone down upon them, and they were terrified.' Luke. Two nine."
Lucifer defied our father, and he betrayed me. You know, my brother... I practically raised him. I took care of him in a way most people could never understand, and I still love him.
From the beginning, he knew this was how it was going to end.About Me
Age Before humanity
Location The Cage
Revive the deceased and heal wounds
Over-power pagan gods and lesser angels
Cause blindness, deafness, and death with true form
Banish angels with a snap of the fingers
Erase specific memories from a person's mind
God created Michael, the first archangel, the eldest of four brothers: Lucifer, Raphael and Gabriel.
~ * ~
After the creation of Heaven, its angels, and Earth and its people, God commanded all of the celestial beings to bow before mankind, asking them to love humans more than himself. Lucifer questioned this order, insisting that they are "flawed, murderous beings." Lucifer then sought out his older brother, Michael, for support, but Michael refused to listen. At some point, God left Heaven. Michael assumed command of the angels, and then ran Heaven and Earth for millennia.
I am a good son and I have my orders
When demons began making plans to free Lucifer, Michael decided to allow the seals binding Lucifer to be broken. He and a group of other angels, including Raphael and Zachariah, wanted the Apocalypse to occur so that he and Lucifer could battle. Michael expected to be victorious, so as to bring about paradise. Lesser angels, like Castiel, were not privy to the plan, and were deployed to make it look as though Heaven was fighting the devil's release. Lucifer was eventually freed. In order to confront him, Michael needed his true vessel, Dean Winchester. Zachariah was instructed to get Dean's permission to possess him. To their chagrin, Dean refused adamantly, and Michael was left to act through his agents. He then decided to speak with Dean in person, when the Winchester brothers were sent back to the year 1978, and used their father John Winchester as a temporary vessel.
~ * ~
Over time, Dean's resolve weakened, and just as he prepared to give his assent, the angels resurrected his half-brother, Adam Milligan, for the purpose of fulfilling the task of "Michael's true vessel." This was a ploy to make Dean give in, but Dean killed Zachariah instead, forcing Michael to take over Adam's body. Michael then met with Lucifer, who inhabited Sam Winchester, on the chosen field. Sam, at the last minute, regained control over his body from Lucifer and flung himself into the Cage, pulling with him Lucifer, Adam, and Michael.