Houston Brooks is a Monarch geological advisor who first appeared in the 2017 Legendary Pictures film, Kong: Skull Island. As a college student, Brooks wrote a thesis discussing the possibility that the long-discredited Hollow Earth theory was actually true, and that massive undiscovered subterranean pockets existed all over the globe. Academics dismissed Brooks' theory, but Monarch's Bill Randa took an interest in it and believed that entire ecosystems of Massive Unidentified Terrestrial Organisms could exist within the Hollow Earth. Randa recruited Brooks into Monarch and brought him and biologist Lin San onto the organization's 1973 expedition to Skull Island, which Randa believed to be an emergence point for the Hollow Earth ecosystem. When the expedition took a catastrophic turn for the worse, Brooks and San were fortunate enough to be among of the survivors who successfully made it off the island, while Randa was not so lucky. Undeterred by the traumatic experience, Brooks became a longtime respected member of Monarch, recruiting other members such as Rick Stanton into the organization. Brooks eventually married San and they had a son named Aaron, who followed in his parents' footsteps and became a member of Monarch. Brooks retired in 2012, but he continued to be in good standing with Monarch and often visited his former colleagues. By 2019, Brooks was again working for Monarch, and was part of a team that established a camp around the waterfall in China's Yunnan Rainforest to monitor Mothra.