(Paperback)

Dr. Cosmic's new students must use everything they know about tyrannosaurs, pterosaurs, and more to find their missing school pet, Oscar the dinosaur, somewhere in the realistic dinosaur exhibit Dr. Cosmic designed and built over the summer. But when a malfunction causes the robotic dinosaurs to come alive, this prehistoric exhibit feels a little too real.

(Paperback)

(Paperback)

"Originally published in hardcover in the United States by Crown Books for Young Readers, New York, in 2016"--Title page verso.

(Hardback)

With the help of Dr. Cosmic's latest invention--a planetarium--his class of clever monsters must complete four challenges. Each time the planetarium shifts and the atmosphere changes, the students find themselves floating from planet to planet in the third installment of this series. Full color.