BJBigfoot BJ was the first of the Monsters to be genetically created for the MvM program. He and his twin sister Betty were separated from each other at an early age, and moved to different training facilities around the world. BJ was released in the mountain ranges of the Pacific Northwest when he was 3 years old. In the years spent alone in the forest, he developed a keen sense of hunting, and an ability to use all of the wilderness to his advantage during a fight.