Marvel Team-Up #4

In "And Then-- The X-Men!", Spider-Man finds himself in a race against time after being injected with the deadly Morbius serum, forcing him to team up with the X-Men to stop the Living Vampire before it's too late. Written by Gerry Conway and brought to life with dynamic art by Gil Kane—whose pencils define the cover, inked by Frank Giacoia—this 1972 Marvel Team-Up issue delivers a pulse-pounding crossover with the mutant heroes, all in a 20-cent comic that remains a standout in the series.