9. He Fought Alongside Captain America In World War II
Despite being something of a mystery when he was first introduced, writers over the years have continued to add to Wolverine's history (the fact that he had no memories of his past made it easy to add things), and one of the most surprising reveals was that he spent at least some of World War II fighting alongside the young Captain America. Even Black Widow ended up factoring into one of those adventures, and despite the fact that Wolverine being inserted into parts of history like this has begun to feel a bit daft, this is one amusing example which paid off as it's made his relationship with Cap much more interesting.