Ultron

Avengers (1963) #55

First Appearance: Ultron — first full appearance

The first full appearance of Ultron, Marvel's most dangerous robotic villain. Created by Hank Pym, Ultron becomes one of the Avengers' greatest recurring enemies. A major Silver Age key — Ultron's profile has risen enormously with the MCU Age of Ultron film.

Avengers (1963) #57

First Appearance: Vision (The Vision) — first appearance

The first appearance of the Vision, the synthezoid Avenger created by Ultron. Written by Roy Thomas with art by John Buscema. One of the most important Silver Age keys — Vision's story of becoming human and finding love with the Scarlet Witch is one of Marvel's greatest. High-grade copies command strong prices.