Note: This story takes place in during the timelines of the cartoons: Alvin and the Chipmunks during the eighties; Jimmy Neutron during the twenty-o's (my term for the first decade of the 21st century).

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Disclaimer: I do not own Alvin and the Chipmunks or Jimmy Neutron.

Chipmunks' universe (1980's)

Simon was in his lab, the door locked tight, taking turns typing codes into his computer and welding and driving screws into the enormous unfinished apparatus it was connected to. One of the rusty pieces fell off and dropped onto his belly, reminding him that it was empty.

Simon left the basement to check the kitchen for fresh-baked treats courtesy of Theodore. He neglected to lock the door behind him.

Bored, Alvin ran into the basement to see what he could mess around with. He saw a table with mysterious, colorful fermenting liquids brewing on it, and he felt the urge to mix them up to see what would happen. But his ADHD had his head turn to the opposite direction to see the machine Simon was working on.

It had been reassembled out of parts from other gadgets of Simon's that Alvin had broken or otherwise been responsible for the failure of. He felt the urge to touch it, but he decided it would be better if he waited until Simon was done before messing around with it.

"Alvin!" Simon reentered the basement holding two piping hot poppy seed muffins. "You better not have touched anything."

"I haven't. Honest this time!" Alvin said.

Simon stuffed a muffin into Alvin's mouth. "If it will satisfy your curiosity to tell you, this is a trans-dimensional teleporter I am working on."

Alvin savored the sweetly intoxicating essence of the poppy seeds. "You mean we can travel to the eighth dimension?"

Simon finished his own muffin. "You do not travel to a dimension. You travel through it. I am talking about travel to an alternate world. Here, I shall show you."

Simon turned on the monitor that had been the same one on which, despite its premature stage of development, he displayed the future, at Alvin's request. At least until the machine broke.

"This is what the alternate universe I have found looks like."

Alvin's eyes popped at the world he saw. The monitor displayed a brightly green suburban area, much like the one where he lived, but there was something… eye-popping about it. It was like the world he was viewing had an extra dimension on top of the third one that was popping into his face. Like viewing a movie with 3-D glasses; it made his world look like a flat screen in comparison. It was giving him a headache.

"Your eyes will adjust," Simon assured him. "This is actually the beginning of the twenty-first century for this world. My machine should be showing me this world on the same timeline as ours, but for some reason, it seems drawn to this particular time…"

"Are you going to go there?" asked Alvin.

"I'm working on it. Travelling to a different time in our universe is one thing, but there are technical restrictions to travelling to a different universe. That is why I am trying to develop a way to traverse the dimensions to arrive at this universe. I am at a loss as to why I am not viewing this universe parallel to our time period; I believe that by observing this world for a while, I might discover why…"