Avengers Vol.1 #54
Life is good for Earth's Mightiest Heroes as they have fun installing their mansion's new security system! But life is not so good for the Avengers' butler, Edwin Jarvis. His mother's rising medical bills have forced him to do the unthinkable! Betray the Avengers to a mysterious individual called the Crimson Cowl! When Jarvis journeys downtown to meet the cowl, he also meets the cowl's accomplices: the new Masters of Evil!
Printed: July 1968
Writers: Roy Thomas
Art: John Buscema and George Tuska
Cover: John Buscema and George Klein