The D-Kids learn of additional dinosaur cards, this time bearing the symbols on Rex and Zoe's tablets. Anxious to gain dinosaur partners of their own, Rex and Zoe send for the cards as quickly as possible, but scarcely have time to get acquainted with their new dinosaur pals before yet another mysterious dinosaur appearance calls them to Egypt. As if pursuing a marauding T-Rex through the streets of Giza weren't enough of a challenge, the children soon find that they aren't the only ones giving chase.