Bruno LaCrosse was born in Brussels, Belgium and was spoiled rotten as a child by his middle class parents. His parents never disciplined him because they feared that it would "stifle energies he might need later in life". They never denied him anything he asked for, even though those things would end up causing some type of destruction or major disaster. His parents were crippled in a car wreck, which may or may not have had anything to do with the repair work he did on their brakes. After the car accident the so called, "wild child" wandered into the swamps where he could do whatever he pleased. It was in the swamps that he met Zartan and the Dreadnoks, who welcomed him in as one of them. He took on the name Thrasher, but even by Dreadnok standards, he is pretty low, and he takes pleasure from inflicting misery and suffering on others. He is entrusted with the supervision of the Montreal, Canada chapter of the Dreadnoks.
Thrasher is later seen helping fight against the threat of Revanche cyborgs, a group that wants to take down Cobra, G.I.Joe and anyone else that would stand in their way.
Sunbow: Thrasher appeared in the Sunbow G.I. Joe TV series. He first appeared in the second season of G.I. Joe, in the episode "Arise, Serpentor, Arise!" Pt. 1. He attempts to earn a spot with the Dreadnoks as he uses the Thunder Machine to pursue Joe forces. He was voiced by Ted Schwartz.
G.I. Joe: The Movie: Thrasher also appeared briefly in the 1987 animated film G.I. Joe: The Movie.