Jean Bison was another member of the notorious Klaww Gang who was helping them attempt to revive Clockwerk. Like all the other members of the Klaww Gang, Jean Bison stole a part(s) of Clockwerk, which, in Jean's case, were the Clockwerk Lungs, stomach, and the talons. Jean Bison also aided the Klaww Gang in the distribution of illegal spices using his Iron Horses (his trains).
As a kid, Jean Bison attempted to find gold in Canada during the Gold Rush of 1852. As a result of using explosives on a mountain, Jean caused an avalanche that ended up burying him. However, the quick freeze kept him alive and preserved him in ice for 120 years until he finally thawed out as a result from global warming.
Jean Bison used the Clockwerk parts by attaching each of them to one of his trains. The Clockwerk parts are so powerful, that it allowed the trains to constantly run, exponentially increasing the rate of spice distribution. This is why he refers to the trains as "Iron Horses".
Jean Bison also had a major role in operations by being in charge of gathering energy from the Aurora Borealis to then make the Northern Light battery. This battery was meant to be shipped to another member of the Klaww Gang, Arpeggio. Arpeggio's plan was to use the power of the Northern Light battery to take over all of Paris.
Jean Bison had a rather arrogant attitude as he believed he was able to "tame" the Wild North and had no problem cutting down trees and interrupting rivers by building dams. Jean Bison believed he was the ruler of the land.