After Adam causes an explosion near the armory, Rex is the only suvivor but is trapped and seriously injured, but is pulled out from the rubble and nursed back to health by Adam. At first, he was hostile with Adam seeing that he is a traitor of the Mogadorian cause but seems to cooperate with Adam as they progress towards the Plum Island. This is a demonstration that not all Mogadorians, especially the true-born ones are not naturally agressive and ruthless. However, as Adam was about to escape with the Chimærae Rex noted that this will be the last time that they will converse as allies. Hinting that no matter there is a certain kindness in his heart, he still cannot defect in their race's cause.