In this episode of Deadly Dinosaurs, Steve goes undercover! He is on a mission to unearth the sneakiest dinosaurs that were far deadlier than they first appeared! We're learning new things about even the most notorious dinosaurs and first up Steve meets Sinornithosaurus - a dinosaur hiding a deadly dental secret. He then races a velociraptor in a climbing challenge with a surprising result. Finally, Steve puts Argentinasaurus to the ultimate test to see how earth shattering its stamp really was.