They had been stuck in the cage for too long with all those strange creatures staring in at them. So when Jason saw that the door had been left open, he knew that they had to take their chance. He also knew that they had little chance of escaping, but any chance was better than none. Even if they didn't escape at least he might get to see more of the zoo, and maybe that would help him be able to plan a better escape in the future.
Christopher thought he was just doing his civic duty, when he turned off the interstate to see if he could be any help to what he presumed was a aircaft in trouble. From the fireball that had shot past him, he didn't think there would be much he could do. But as it had seemed to crash just over the hills to his left, he had to at least go and see if there was anything he could do. He would never have imagined that it would lead to him being stuck on a prison ship with six other prisoners.
After years of experience and thousands of missions during those years, someone in the TransMerge force's tech department still managed to mess up Josh Adams latest mission. Now he had to find a way of completing his mission, when he is not where or who he is meant to be.