Five days after the Battle on the Golden Gate Bridge, he joins Caesar, two fellow chimpanzees, Rocket and Sam, three orangutans, Keling, Musang and Eastwood, and one bonobo named Koba as they distract a helicopter. Dallas lets out a screech as he prepares to jump at the helicopter before Caesar stops him. Together they draw the helicopter away from the main troop, only to find more humans on the ground with both tranquilizer guns and regular guns. The apes escape but Dallas jumps down from the trees to attack one of the soldiers, Flores, and Flores pulls his sidearm and shoots Dallas. Dallas is injured but keeps up with Caesar and his troops for a while until he dies of his injuries. He is found dead by Malakai Youmans and Clancy Stoppard the next morning.