|“||But something is about to spoil their lunch; something nastier, hungrier, and three times bigger.||”|
— The narrator builds up the entrance of the predators
In Alpha's Egg, a mated pair of Carcharodontosaurus serve as the secondary antagonists of the episode. The brown individual is likely a male, and the white individual appears to be female. They are incorrectly depicted as living in South America, in the Forests of Patagonia 80 million years ago, when they lived in Africa and died out 93.5 million years ago.
Near the beginning of the episode, Dragonfly and his mate stumble across a dead Saltasaurus, they decide to scavenge from it. Little do they know, a pair of Carcharodontosaurus are returning to the kill. The massive brown male approaches the two Aucasaurus and lets out a loud bellow, causing them to back off. The male Carcharodontosaurus eventually forces the Aucasaurs to leave, and turns back to his mate so they can feast.
Later in the episode, the Carcharodontosaurs emerge from the trees and onto a field, where the Saltasaurus Herd is making their way across it. Alpha is lagging dangerously behind because of her injured leg, so she has to pick up the pace. No one wants to be last. The Carcharodontosaurs usually make a u-turn to the back of the herd, and stroll towards whoever is in the back and kill them in seconds, as the predators are larger than the saltasaurs themselves. Alpha manages to outpace an older female, and is safe. However, the old Saltasaurus is not so lucky, and is killed with a crushing bite from the male Carcharodontosaurus. The two apex predators drag the saltasaur back towards the trees, and feast.
- They make distorted elephant roar sounds, something that the Daspletosaurus of Dinosaur Planet also use. These sounds have been positively received, and may have been the reason for the show winning two Emmy awards for sound editing and mixing.
- The saltasaur killed later in the episode is actually the same one from the beginning that Dragonfly and his mate scavenge from.