Captain Marvel #5

Published in 1968, Captain Marvel #5 features the debut of the iconic red and blue costume for Mar-Vell, designed by the legendary artist Gene Colan. The issue was part of a transitional period for the character, as Marvel Comics sought to refine the Kree warrior's aesthetic to better fit the shifting tone of the Silver Age of comics. Written by Arnold Drake, the narrative focuses on solidifying Mar-Vell’s role as a terrestrial protector while navigating the complex intergalactic politics of the Kree Empire.

The issue is historically significant for its visual departure from the character’s original, more utilitarian green-and-white uniform. Colan’s design aimed for a more heroic and vibrant appearance, utilizing bold primary colors that became synonymous with the character’s long-standing identity. Upon its release, the issue was received as a necessary evolution for the series, helping to distinguish Captain Marvel within the crowded Marvel roster and setting a template for the character's costume that would persist for decades.