Ms Frizzle then gets a letter from an old high school friend who is now a paleontologist and she decides to take the class on a trip to the dig.

The episode's main aim was to show that dinosaurs weren't all terrifying monsters, like movies often make them out to be.

This episode is loosely the television adaptation of The Magic School Bus In the Time of the Dinosaurs (from the book series).

In this episode, the kids visit Ms. Frizzle's old friend, Dr. Carmina Skeledon at a dinosaur dig, as opposed to Jeff in the book.

Dr. Skeledon lets Arnold see a fossilized dinosaur egg that Ms. Frizzle finds as the kids are leaving, and he still has it when they go back in time.

Having gone back "67 million years, give or take a month or two", as Ms. Frizzle tells them, the kids are frightened away by the appearance of large, long necked dinosaurs called Alamosaurus, a titanosaur.

Arnold trips into a mud puddle, losing the egg, and he hides under the bus as Phoebe runs back on.

Ms. Frizzle grows Arnold as the Tyrannosaurus attacks the bus, and he scares it away, the class learning that the carnivore only wanted "an easy meal without a fight".

Ms. Frizzle is missing three photographs of prehistoric animals from her photo album of her last trip to the age of dinosaurs.

When all three photos are found, in the end, the Friz awards the player with a mask of a prehistoric animal to print and cut out.

This game in the original software series is loosely the software adaptation of The Magic School Bus In the Time of the Dinosaurs from the book series (and The Magic School Bus The Busasaurus; the cartoon version of said book).

But in this version (despite the cover for the software), the Bus is animal mecha and transforms into two dinosaurs and one pterosaur (Coelophysis, Stegosaurus, and Pteranodon).

Because since the other version (the TV adaptation) only showed the Cretaceous period, the Bus transformed into two prehistoric animals.