Beastmon is an Ultimate Digimon.
In Fusion, Beastmon is the princess of Lake Zone who later joined Fusion Fighters. She also ate Tyutyumon of Bagra Army.
In Ghost Game, when Beastmon appeared in the human world, she immediately began to use her powers to control human cats, and then she made the cats take humans and train them. When she used her powers not only on cats but also on humans, she used cats to manipulate humans, and used them for her own needs. She also wanted to test manipulated people as her servants, and all the people who failed she put into digging for training. But when Ruli, Angoramon, Jellymon, and Espimon came to rescue Hiro, Gammamon, and Kiyoshiro, who fell under her power, they initially used silver vines against her because it was cats' weakness. And when the people were freed from her control, she began to fight against Rul and Lamortmon, and she was really cunning and persistent to them, and during the fight she turned Lamortmon against her friends. Canoweissmon and Thetismon then joined the fight, and when she tried to turn Thetismon against her friends, she failed thanks to the silver vine Thetismon had with her. And when Lamortmon returned to her original self, Canoweissmon and Hiro defeated her and put an end to her plans. And after the battle, all humans and cats returned to normal, and after that she continued to watch, hoping to find a partner one day.