"You knew about this? YOU KNEW?! I'LL KILL YOU!!!" —-Billy Yoder(src) William "Billy" Yoder is the hidden main antagonist of Jurassic Park: The Game and one of several mercenaries sent in into Jurassic Park after the disaster in the park. InGen had send Yoder and the others to rescue the Hardings, Laura Sorkin and Nima Cruz from the island.