The Werewolf by Night character (birth name Jacob Russoff, legal name Jacob Russell, nicknamed Jack) first appeared in Marvel Spotlight #2 (Feb. 1972) and was based on an idea by Roy Thomas. The series name was suggested by Stan Lee and the debut story was crafted by Gerry Conway and Mike Ploog. The character made additional appearances in Marvel Spotlight #3 and #4 and then graduated to his own eponymous series in September 1972. Jack Russell co-starred with Tigra in Giant Size Creatures #1 (July 1974), which was the first appearance of Greer Grant as Tigra instead of the Cat. That series was retitled Giant-Size Werewolf with its second issue.