It was actually Doctor Herdlip, who had been splashed with Herbicarnus-X on his way to Baronia during the events of The Carnivore Curse. Because of the chemical's properties, the sellosaurus began to transform, both times bursting into a baryonyx kitchen and terrorizing its staff, as well as attacking Teggs, Arx, Gipsy, and Iggy. As the carnivore creature, Herdlip was no longer in control of his actions and was almost mindless. When he changed back into himself, he didn't remember all of his actions as the monstrous beast.