At one time, Chase was on the side of good; however, Hannibal Roy Bean told him that he could only achieve his destiny as the greatest warrior of all time on the Heylin side. Hannibal showed a fake hologram to Chase of his former best friend, Master Monk Guan saying he would soon destroy Chase. He was convinced to drink the Lao Mang Lone Soup, which ended up costing him his soul and have him eternal youth as well as the ability to transform into a lizard at will. The main ingredient in the soup is dragons.
But Chase, so overwhelmed by his new power, betrayed Hannibal Bean and sealed him in the Ying-Yang World for many years. Chase has lived for so long that he has been around the world. Wherever he went, he defeated great warriors. Whenever he defeats a warrior, Chase takes control of their chi and their physical form, transforming them into a legion of "Jungle Cats". The Jungle Cats (also known as Chase Young's Fallen Warriors) were lions, tigers, and panthers, but on Chase's command, retake their human form, or other forms such as birds. Chase can give these animal minions any command by simply snapping his fingers.
Chase Young first appeared in Twilight and Kyle's Beginning of Equestria Girls, where he hired Sunset Shimmer to steal Twilight's crown from Equestria, until Twilight were going after her to the alternate world to get her crown back by going to the Princess of the Fall Formal. Sunset however betrayed Chase by wearing the crown and transformed into a demon, killing him, that makes his son Venom, Adagio Dazzle and their Heylin villains get revenge on her, starting with Twilight and her friends by stealing their magic and rule the entire world with the 10,000 Years of Darkness in Team Rainbooms and Team Owls' Adventures of Equestria Girls.