The T. rex stomped toward Metro City Elementary School.
Roar! The entire school shook.
The T. rex peered into a window.
Terrell gulped. "I thought it would be cool to see real live dinosaurs.
I don't think so anymore!"
"Look at those teeth!" Jack cried.
"I hope Rocket Girl comes soon!" said Mara.
Suddenly—zoom! Roxy flew past the T. rex's head.
"Rocket Girl!" cried Terrell.
Roxy landed in the kickball field.
"Hey, T. rex! Try to get me!"
The T. rex roared and stomped toward Roxy.
Whiz-hoo! Roxy's eye laser beams blasted a big hole in the ground.
The T. rex tumbled into it. Roar!
The dinosaur stomped around in the hole, trapped.
Roxy was about to fly away when she noticed a jeep nearby.
The man inside had a pair of binoculars and a safari hat.
He was watching two tall dinosaurs eat leaves.
"Hmm," thought Roxy.
"I wonder who that man is."
Just then the man looked at Roxy and gasped.
He dropped the binoculars and drove off fast.
"Now that is suspicious!" said Roxy.
She blasted into the air and flew after the jeep.
Roxy followed the jeep into the mountains.
It soon arrived at a large mansion.
The man jumped out of the jeep and ran inside.
Whiz-hoo! Roxy blasted open the mansion's doors and went in.
But she didn't see the man anywhere.
Using her super hearing, she listened.
Tick-tock, tick-tock, tick-tock.
Roxy could hear many clocks, all ticking at once.
Roxy followed the sounds to the basement.
There she found a laboratory full of clocks, watches, and calendars.
The man with the safari hat stood before a giant clock.
Instead of hours and minutes, years and centuries marked the clock.
"How did you get in here?" asked the man.
Roxy didn't answer. "Who are you?" she asked.
The man folded his arms.
"I'm Professor Flashback," he said.
"And I'm time traveling."
"Time traveling?" asked Roxy.
"Yes," said Professor Flashback.
"I wanted to study real live dinosaurs.
So I made Metro City travel millions of years into the past."
"Well, you have to return the city to the present," said Roxy.
"Dinosaurs are destroying everything!"
"Hmm," said Professor Flashback.
"The present is so . . . boring.
Let's go to the Stone Age instead!"
He reached for the clock's hand.
"No!" said Roxy. "You can't just—"
Smash! The laboratory door burst open.
Dinosaurs swarmed inside!