Wolverine (birth name: James Howlett; colloquial: Logan, Weapon X) is a fictional character appearing in American comic books published by Marvel Comics, mostly in association with the X-Men. He is a mutant who possesses animal-keen senses, enhanced physical capabilities, powerful regenerative ability known as a healing factor, and three retractable claws in each hand. Wolverine has been depicted variously as a member of the X-Men, Alpha Flight, and the Avengers. The character appeared in the last panel of The Incredible Hulk #180 before having a larger role in #181 (cover-dated Nov. 1974). He was created by Marvel editor-in-chief Roy Thomas, writer Len Wein, and Marvel art director John Romita Sr. Romita designed the character, although it was first drawn for publication by Herb Trimpe. Wolverine then joined a revamped version of the superhero team the X-Men, where eventually writer Chris Claremont and artist-writer John Byrne would play significant roles in the character's development. Artist Frank Miller collaborated with Claremont and helped revise the character with a four-part eponymous limited series from September to December 1982, which debuted Wolverine's catchphrase, "I'm the best there is at what I do, but what I do best isn't very nice." Wolverine is typical of the many tough antiheroes that emerged in American popular culture after the Vietnam War; his willingness to use deadly force and his brooding nature became standard characteristics for comic book antiheroes by the end of the 1980's. As a result, the character became a fan favorite of the increasingly popular X-Men franchise, and has been featured in his own solo comic book series since 1988.