“Eternal youth! Eternal youth!” shouts Mabel.

“IT IS DONE!” bellows the wizard, before handing Mabel a flask of glowing purple liquid.

Mabel pops the cork and holds it to the sky.

“Good-bye, wrinkles. Good-bye, crow’s feet! Good-bye, weird cottage cheese spider skin that happens in your forties!” She toasts before gulping down the flask of youth serum. She burps and pounds her chest before handing the flask to Dipper. “Here you go, bro. Hit this.”

Dipper swirls the liquid, looks at it cautiously, and then takes a sip. “Huh. How can we tell if it worked?”

Mabel shrugs.

Blendin guzzles the last of it. “Do I have any more hair?”

In a few months, the twins and Blendin feel the same.

Dipper notices his scrapes and bruises heal quickly.

In a few years, Dipper and Mabel realize they’re not hitting puberty like the rest of their classmates.

Blendin realizes he looks the same as always.

In a few decades, everyone they’ve ever loved has perished in the Time Baby uprising.

“I’m starting to think this was a bum deal, guys,” says Dipper a long time later. “It’s been thousands of years and my voice still hasn’t dropped.”

“Yeah, and I’m finally starting to run out of new sweaters to wear,” says Mabel. “This is a real bummer.”

“Do I look any younger?” asks Blendin.

“You look…older,” says Mabel. “Poor guy.”

“What should we do with our free time?” asks Dipper.

“Let’s dance in style, let’s dance for a while,” Blendin says.

“All we have is our boxes of stuff from throughout history,” mutters Mabel. “Hey! Maybe we should open a Museum of the Past!”

“Ooooh! I like museums! And this will keep our minds off of the existential horror of being immortal!” says Dipper.

So the twins get to work making their museum, which is actually very educational and popular in the future.

Blendin eternally mops the floors.

But the search for the treasure has reached its…

END.