Avengers #54 key issue

First (cameo) appearance of Ultron in "And Deliver Us From -- The Masters of Evil!" Part 1 of 2. Guest-starring the Black Knight. Script by Roy Thomas. Pencils by John Buscema. Inks by George Tuska. Cover by John Buscema and George Klein. 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! The villainous quintet includes Klaw, Whirlwind, the Radioactive Man, the Melter, and the Black Knight! However once the knight learns what the Crimson Cowl is planning, he tries to warn the Avengers! But the new masters intercept him right above the mansion!