Maybe it's not Olivia who brings him back. Might be continued, but hey, these are drabbles. Came to me after 'One Night in October'.

"Peter."

The name had flashed into Walter's mind as suddenly as a craving for a strawberry milkshake or some Red Vines might. There was, however, something different about that name than when he thought of his long-dead son. His own Peter. Something that wasn't present in a need for a dessert. Sort of an echo, a haunting feeling that was strong and dimmed. A fading echo.

The name was there when he worked away on the serum he'd created with the express purpose of reviving the dead. That had been a desire sprung out of Peter's death more than twenty years ago. A project he'd felt the need to do in Saint Claire's for seventeen years. He hadn't had the materials to work on it, or the time, or the faintest idea how to begin.

But in retrospect, those were excuses. He could've asked for lab time as a reward for good behavior.

But why hadn't he?

Then all the flashes of the man. In his lab, his bridge room, his television, for crying out loud! Why wouldn't he go away?

Then the night after that had happened.

Walter, I'm here.
"Who are you?"
Can you hear me? I'm right here.
"No."
Walter, I'm right here.
"No, you're not."
I'm here, Walter.
"You - you're just a fig - a figment!"
Walter, I'm right here. I'm here, Walter. Right here. Walter, I'm here. Can you hear me? I'm right here. Walter. Help me, Walter. Please help me.

All that fuss over him.

But...what did the voices want from him? Was it his serum? His knowledge? His lab?

Who knew?

... ... ... ... ...

"WHY WON'T YOU LEAVE ME ALONE!" Walter roared.

Astrid had heard, and so had Lincoln. They'd rushed to his side, and Astrid had been begging him to tell her what was wrong. But Walter had refused and tried to hide in the sensory-deprivation tank. Thank God they'd emptied it after Walter's previous...mishap with the tank. When he'd claimed to have seen a man in the lab. After that, he'd broken or damaged at least five objects per week. The last one had unfortunately been Olivia's dress shirt. The one before that was a beaker of the serum. It had splashed all over the floor of the lab, prompting Astrid to clean it up.

Walter had a mystery to solve...who was this man? Why was he stalking him? And where were the Red Vines?