When Trek and Tristan find a bone in the schoolyard, Dan uses a paper-mache skull in Mrs. Hahn's art class to figure out if it came from the Stygimoloch.
While Dan and his friends have a sleepover at the Royal Ontario Museum, Dan has to get a T-rex claw back from some dinosaurs before the museum opens in the morning.
Jim the Reptile Expert returns to Ms. Carver's class with a Chameleon promoting Dan to question if the Stegosaurus could change the colour of its plates.
Dan uses the art of disguise to get his Remote Dino Cam into a Triceratops nest but the real test comes when a T-rex threatens the safety of the babies.