Madelyne Pryor
Madelyne Pryor was introduced during the acclaimed 1983 "Uncanny X-Men" run that saw long-time writer Chris Claremont pair with artist Paul Smith for a series of issues that would see the Jean Grey look-alike marry the retired X-Men leader Scott Summers (Cyclops).
Team-up
The first team-up between characters published in different comics from the same publisher was made in 1940, by the editorial MLJ Comics. "Pep Comics" #4, by Harry Shorten and Irv Novick, featured a story with the Shield, which was continued in "Top Notch Comics" #5, by Will Harr and Edd Ashe. In that comic, the Shield met the wizard. Timely Comics would follow, with a team-up between Sub-Mariner and Human Torch. National Comics Publications took the team-up concept one step further and created the Justice Society of America, the first superhero group, composed by superheroes that starred their own comic books.