During Camp Jupiter's War Games, Larry helps defend the fort. Despite the attempt, the Fifth Cohort manages to break through and win the game. During the Senate meeting to discuss the quest to Alaska, he seconds Senator Hank's objection to all Fifth campers going on the Alaska quest, claiming it would be a suicidal mission even for demigods from a good cohort. Dakota retorts that Larry's cohort had their podex whipped by the Fifth at the Roman War Games the night before.
Larry is at the Senate meeting to decide if Camp Jupiter should let the Argo II land or not.