Days turned to weeks, which turned into a month. Doc worked endlessly never taking his mind off of his goal. Clara had to force him to take a brake and eat. She'd often catch him asleep in the Delorean. She took pity on him and she worried. Not only because he appeared to have lost his ability to care for himself but also because she knew his life would be in danger if he traveled back in time. Finally the new time machine was complete.

Later that night the couple snuck it out to the abandoned parking lot of the Lone pine mall.

"Are you sure you know what you're doing?"

Doc stared at her. "Yeeeaaah, I have done this once or twice you know."

Clara rolled her eyes and crossed her arms to keep the shivering to a minimal.

"Clara…" He went to put his arms around her, "trust me. I'll be back before you know it…with Marty."

He stopped. Lately saying that name had seemed more difficult to do. Mostly because with the boy stuck in that mahogany box under the ground there was no reason to say it. It wasn't as if he could call him or see him. Well all that was about to change. Doc could say that for certain.

He looked around making extra sure he had taken care of everything. "Well, I guess that's everything."

Clara looked at him, taking in every detail. "With or without Marty come back please."

Doc shook his head. "I can't leave him there make all this work for nothing."

"Emmett if, god forbid something goes wrong. I don't want you to get hurt or stuck there. If you can't save him, let him go. Let whatever's going to happen, happen."

Doc knew she was frightened and he was as well. He could understand her desperation but she couldn't understand his. Marty was…young to say the very late.

"Clara, I love you and I know what I have to do."

He held her one last time. Long and hard. "Don't worry."

He climbed into the Delorean, turned on the engine and the time circuits.

He stepped on the gas gaining speed as he zoomed towards the desolate mall.

60 mph, 75 mph, 80, 85, 88

There was a flash and Doc quickly recognized Hill Valley, as it was 100 years before.