As he came to his senses, his head pulsing with the pain from the blow delivered to him by his future self, Dean's eyes opened to the sight of the untamed foliage of this apocalyptic future world, its vigorous growth somehow at odds with the destruction that was being meted out to the planet.
In this seemingly alien scenario which his twin inhabited, Dean felt a little bit like Alice must have as she slipped down into the rabbit-hole, suddenly finding herself out of her depths in a land where new rules and regulations were the norm.
This wasn't the case for his look-alike however, this devastated world was home to him, a place where his future self was now perfectly integrated.
Each day was a battle for survival, continuously losing men to the Croatoan virus and to the other dangers present in this outlandish reality.
Dean wondered why the obnoxious Zachariah had sent him here. He and his angel buddies pretended to work for the good of all but the only interest they really had was for their own little schemes. Guardian angels! Yeah, that'd be right!
He pulled himself shakily to his feet, the cries of battle clearly audible from the inside of the building into which his future self had knowingly sent his men to certain slaughter. His strategy in attacking the enemy head on was suicidal.
Dean couldn't understand why this Dean would go with such an idiot plan.
He took stock of the area and decided to follow a grassy footpath that seemed to go round the back of the construction. Maybe he could sneak in somehow and distract the enemy in order to give future Dean's men a momentary respite by staging a surprise attack from the rear.
He continued on until he came to an open space, once a garden before the world went topsy-turvy. His his heart cried out in silent agony as he immediately recognised the figure that stood before him.
He glanced over to the side where he saw his other self abandoned face-down on the ground like some broken rag-doll, dead, surely by the hand of that self-same being that stood smiling before him, his baby brother Sammy.
"Dean, what an unexpected surprise," his little brother's voice intoned almost fondly, and although the soft moss- green eyes were those of his brother, the expression they held was that of Lucifer, the fallen angel for whom his little brother had been tailored like a suit.
Destined to clothe this dark being and nothing else.
Dean hadn't realised until he saw this travesty of his sibling, what exactly was waiting for his brother.
Even when Sam had called him earlier back in the motel room, terrified with the new-found knowledge of his destiny as the Devil's own vessel, he hadn't really understood. Couldn't quite imagine what that entailed.
Now the situation was far too clear!
Future Dean had chosen this path, had chosen not to stand by his brother, not to help him in his moment of greatest need, but his future self had been horribly, terribly wrong.
Dean swore by all he held dear that if he got out of this bizzarro world, he'd never do what his future self had chosen to do; abandon Sam.
Here however, he was at Lucifer's mercy.
"You wanna kill me now or are you saving me for later?" Dean spat out defiantly.
If he was gonna be killed by this simulacrum of his brother, then he would go down with pride and not begging for his life. He'd been in Hell once, he could take it again.
Lucifer smiled with Sam's familiar lips, at Dean's words. He had no need to kill him, for what was written, was written and Sam would be his.
Dean had barely time to internalise Lucifer's last words. "We will always end up here- I win. So I win," when he again found himself in the loathsome company of Zachariah.
"You saw what happens Dean; you know what you have to do. Michael is just waiting for you to say yes."
Dean stared over at him with disgust in his eyes.
"What you and your boss want will never come to pass. I'll save Sam, and you and your bunch of angels can go crap yourselves."
When he was finally alone, his fingers went faster than the speed of light to Sam's number and he called his brother to him.
He'd been wrong, so wrong to push his younger brother away, but he was never going to go down the same road as future Dean.
He went to meet his brother.
The man who came towards him was his Sammy, not that abomination clothed in Sam's Sasquatch body he'd encountered in the future.
He desired nothing else but to throw his arms around his baby brother and promise him that everything would be all right, but he reined himself in.
It would take a little while for them to get back to being the brothers they were before all this crap hit the fan, but he had no doubts that they would.
"Sammy. Look, man, I'm sorry. I don't know what I was thinking. But I was, uh—wrong."
He held out the knife as a peace offering and Sam took it, but he could see that his baby brother was suffering.
Dean vowed he'd make things right, no matter how long it took.