"How did Bill Cipher Time Travel into the World War Two Era Without Changing Human History?" Stanford Pines demanded in sudden disbelief.

"The Time Baby helped us Defeat Bill Cipher During World War Two." Agent Powers answers.

"So where did this Underground Military Base come from?" Stanford Pines asked worriedly.

"The Time Police Built this place inside Gravity Falls During World War Two." Agent Powers answers.

"The Talking Lab Rats?" Stanford Pines asked pointedly.

"Genetic Experimentation done behind Time Baby's Back, the Lab Rats became intelligent enough to rebel against their Human Creators." Agent Powers explained sleepishly.

The Pines Family frowned distastefully at Agent Powers together.

"You Created Intelligent Lab Rats Behind Time Baby's Back?" Stanford Pines asked worriedly.

"We have been fighting the Intelligent Lab Rats for the last 50 Years." Agent Powers answers pointedly.

"50 Years?" Stanford Pines asked worriedly.

"Not all of the Talking Lab Rats stayed inside Gravity Falls, they scattered and Attacked Military Research Centers for their personal revenge on Humanity." Agent Powers explained.

"Why would the American Government Want Talking Lab Rats?" Stanford Pines asked bewilderedly.

"The American Government Distrusted Time Baby and his Time Police, they wanted their own Disposable Rat Army to Defeat Bill Cipher with instead." Agent Powers explained.

"Intelligent Rat Soldiers, Insane Desperation Against Bill Cipher has doomed us all!" Stanford Pines proclaimed fearfully.

"The Time Baby came from the future to Defeat Bill Cipher and the American Government got caught in the middle, the Intelligent Rat Soldiers were the fastest solution to keep both sides distracted until help arrived." Agent Powers explained.

"Your Delaying Tactic created another enemy from within your own ranks. What was Bill Cipher's Reaction?" Stanford Pines asked suspiciously towards Agent Powers.

"Bill Cipher gave the Nazi Government their own Time Travel Equipment and he escaped across history with them." Agent Powers answers pointedly while the Pines Family frowned at each other nervously.

"Wait, the Nazi Government has Time Travel Equipment and Bill Cipher is helping them?" Dipper Pines asked worriedly.

"Unfortunately, the Nazi Movement are still sending Time Travelers against the American Government regardless of them vanishing and Time Baby is against giving us Time Travel Equipment of our own." Agent Powers responds nervously.