Pierre Bouchet is an Immortal, who appeared in the film Highlander: The Final Dimension.
The age and origin of Pierre Bouchet are unknown. Whether he is a Frenchman, as his name suggests, or whether this was just a pseudonym, can not be said with any degree of certainty.
In 1789,Bouchet was with his friend, Connor MacLeod, on the estate of Monsieur de Frenet in Paris, when the Revolution broke out. Events are cloudy; however, but it might be assumed that MacLeod and Bouchet were the side of the revolutionaries, or at least neutral.
Under unknown circumstances, MacLeod was eventually arrested and imprisoned in Paris. In 1792, with the approach of the execution of Connor by guillotine, Pierre, who had been drinking, decided to save Connor.
Bouchet had tired of the Immortal life, and so visited Connor in prison, knocked him out, and took his place at the execution. He was taken to the scaffold, and once there, he was beheaded by guillotine.
His Quickening was presumably lost, as no Immortal was close enough to receive it.