Thanks again to Allanon-One, who added in more description to this story 

The man in the passenger seat of the car turned around to look at Marty.

'This him, Jim?' said one of the men who was gripping Marty. Marty didn't know why he was being held so tightly; the pain and dizziness of being hit so hard was so bad he was hardly able to hold his head up, let alone try escape.

The man in front took a drag of his cigarette and smiled, yellow teeth flashing Marty a hideous smile second only to Biff's drunken leer. 'That's him. That's Tannen's boy.' He reached out roughly to squeeze Marty's chin; he jerked away, sending a fresh throb of pain through his head. The man chuckled. 'We were going to use your older brother or sister, but since your brother's a drunkard and criminal and your sister's in debt, we figured old Biff wouldn't care too much about them…but not you.' He narrowed his dark eyes at Marty. 'When we heard you'd come home from Switzerland, we knew our chance to get something off Biff had finally come.'

Marty felt sick. Uh oh…this is not good. 'Well, I think you must have made a mistake,' he said, thinking fast. 'Biff hates me most of all. He doesn't give a damn about me – '

'But not your mother, eh?' Marty fell abruptly silent. Jim nodded in satisfaction. 'Thought not. You're her little darling, aren't you? Her baby.' The two on either side of Marty sniggered, and he felt his cheeks flush with rage. 'She'd do anything to keep you safe, wouldn't she? She'll make Biff pay up, all right.'

'Yeah, well…he won't – he won't listen to her…' said Marty helplessly, knowing it was no good.

'What's the matter with you? You want us to kill you now instead of later?' Jim gave him one last look of contempt and turned away.

Marty closed his eyes in despair. Biff wouldn't give them any money that was for sure. Not for Marty, no matter how much his mother pleaded. And Marty would be killed…and then – what would happen? A paradox – that's what Doc kept talking about…

Doc.

All of a sudden, Marty didn't care what happened to him anymore. It was all over, whether he lived or died. Doc was gone, and he wasn't ever coming back. Marty still couldn't bring himself to believe that Doc had left him. Left him.

If Marty died, there would be a paradox or something; or maybe there wouldn't, he didn't know about this sort of thing. Maybe he would just die and this awful 1985 would go on, only for the universe to collapse on itself in October in 2015. He thought then that he would rather die than live. Here he had no one. No Doc. He felt betrayed, even though he knew it was his own fault. If only he hadn't been so stupid in 2015! The worst part of it all was that he knew Doc hated him. No matter what he tried to tell himself, he had seen the evidence for himself. Doc had left him here, and now look at the mess he was in! And whether he lived or died, it was inevitable that the real Marty of this world – who was presumably still in Switzerland – would turn up, and God knows what would happen then. At least his mother would be happy; that is, if Marty lived and she was suddenly landed with two of them…

Marty couldn't think about it anymore.

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His kidnapper's headquarters was a tall, shabby-looking building that stood in a street just as quiet as the one where Doc's lab had been. The windows were cracked, in some places they were missing altogether. Marty was pulled out of the car and brought through a small door that led onto the street. A guard stood just behind it, and nodded respectfully to Jim, who was obviously the leader.

The building was dark and gloomy inside, and the air was chill. Marty shivered as he was marched down the long, dark corridor. There were doors on either side of him, but all were shut tightly. There was one lone door at the very end of the corridor, and it stood slightly ajar.

When they reached it, Jim turned and nodded to the two men holding Marty. He was shoved roughly through the door into a small room with no window, a mattress in one corner and a bucket in the other. It was even colder in here than in the corridor.

Jim stood in the door, grinning nastily. 'Welcome to your new home, kid. Guess we'll be contacting Biff to hear his answer. But don't be worrying – you've got three days to live. After that, it's decision time.'

He slammed the door shut and Marty heard the key turn in the lock.

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After an hour of calling and searching for Marty, Doc gave up. Einstein couldn't pick up Marty's scent. That was strange, and Doc thought uneasily that it was likely Marty had been in the car he'd seen driving away just as he re-entered 1985. But why would Marty have gotten into a car with someone? Surely he didn't know anyone here. Perhaps it had been his brother or sister…

Doc and Einstein went back to the lab. It was too dangerous to continue wandering the streets at this time and they both needed some sleep. Einstein curled up in his basket and Doc settled himself into the corner, knowing that it was unlikely he would manage to fall asleep. His head was full of thoughts about Marty. Where could he be in this harsh and unforgiving world? Doc could only hope that he would manage to keep himself out of trouble until the morning and that Doc would find him tomorrow.