Werewolf by Night (birth name Jacob Russoff, legal name Jack Russell) is a fictional character, an antihero werewolf in the Marvel Comics universe. The Werewolf by Night (usually referred to by other characters simply as the Werewolf) first appeared in Marvel Spotlight vol. 1 #2.
Werewolf by Night, Volume 1 ran for 43 issues during the 1970s. Issue #32 is notable for containing the first appearance of Moon Knight. Five 'Giant-Size' editions were also published during this time. Jack Russell also co-starred with Tigra in Giant Size Creatures #1, which was the first appearance of Greer Grant as Tigra instead of the Cat.
Jack Russell was dormant for most of the 1980s. The character's appearance was radically revamped in Moon Knight, Volume 1 #29. He guest-starred in various issues of Spider-Woman, Volume 1, West Coast Avengers, and Doctor Strange: Sorcerer Supreme.
Werewolf by Night was later revived in the pages of Marvel Comics Presents, where he appeared irregularly from 1991-1993. He also made regular appearances as a supporting cast member in the pages of Morbius, the Living Vampire from 1993-1995. A letters page in an issue of Morbius mentioned that a Werewolf by Night miniseries by Len Kaminski and James Fry was in the works, but the miniseries was never published.
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