The year was 1974 and the ending of The Incredible Hulk #180, by Len Wein, Herb Trimpe, Jack Abel, Christie Scheele, and Artie Simek, introduced a new character on the last page. The next issue would contain the first full appearance of a hero named Wolverine as he got involved in the battle between Hulk and Wendigo at the behest of the Canadian government. It would be easy to imagine that this new character was destined for the background of group shots if he ever appeared again, but writer Len Wein brought the character over to the X-Men with Giant-Size X-Men #1 and the rest is history. The X-Men became the most popular team in comics and Wolverine was the breakout star of the book, leading to multiple appearances in miniseries, one-shots, and finally his own ongoing book.
Source：https://www.cbr.com/50-years-of-wolverine-xmen-best-there-is-at-what-he-does/
