New Mutants #19 (1984)

"Siege"

Combining elements of Native American mythology, paranormal psychology, and extra-dimensional sorcery, New Mutants #19 delivered all the over-the-top action and unbridled imagination that made the early run of the New Mutants such a compelling buy.  Bill Sienkiewicz's cover masterfully depicts the young mutant heroes fighting a desperate battle against the Demon Bear of Dani Moonstar's nightmares.  The imposing visage of the bear, almost obscuring the moon and seemingly impervious to harm and the elements, only heightens the impact of the issue number inset illustrating the critically injured Moonstar, her life hanging in the balance of the battle her friends wage on her behalf.  

Web of Spiderman #32 (1987)

Part 4 of "Kraven's Last Hunt"

One of the most instantly recognizable Spidey covers of the 1980s.  The "Kraven's Last Hunt" storyline began shortly after the death of Ned Leeds and the marriage of Peter and Mary Jane.  The arc traced Kraven's victory over Spider-Man and Kraven's donning the Spider costume in an effort to exorcise his frustration and psychosis induced by countless defeats from the webslinger.  While the storyline saw the eventual death of Kraven, the compelling drama and tension of the series (as reflected in the cover and pencils of Mike Zeck) has made this storyline required reading for true Spidey fans and one of Marvel's finest of all time.