Henri Crosteau was one of the antagonists in Destroy All Humans! Path of the Furon, who was an Oceanographer, Scientist, and CEO of the Francodyne Industries.
Fought in Belleville, Crosteau's enterprise was responsible for the mass-production of the Nexosporidium Warriors. In his first appearance at his Chateau, Crosteau was questioned by Crypto and Orthopox, but escaped after he stabbed him with a Lion Fish. Later, Crosteau developed a giant shield that protected his last factory, which ended in failure again. Crosteau's final appearance was in "All Hell Breaks Loose", where he fought Crypto at Belleville Tower in a giant squid-like robot, that was made of Nexo Technology and was defeated by Crypto. Before he died, Crosteau revealed that the synthetic DNA that was used for creating the Nexos and a Furon ship fell on Belleville with the product on it. Crosteau's final words were that the true mastermind of the plan was on Furon and died shortly after, due to falling from a great height.
Henri Crosteau was highly protective with nature (specially the Ocean), and was the self-titled "Lord of the Sea". Henri was arrogant and cocky about his business and machines, and seemed to know a lot about hijacking frequencies (as shown by his capacity of eavesdropping on Crypto's communicator frequency). During battle, H speech is almost poetic in manner of speech, as he describes the battle as a documentary. He later recognizes that he was being used and asks for Crypto to apologize him for condemning his species.
- Henri Crosteau was a play on famous Oceanographer, Jacques Crosteau.