Featured Characters:

• Uatu the Watcher
• Black Widow (Natasha Romanoff) (First appearance)
• Hawkeye (Clint Barton) (First appearance; dies)

Supporting Characters:

• Arnim Zola (First appearance)

Antagonists:

• Ultron (First appearance chronologically) (Origin revealed)
• Ultron Sentries (First appearance)

Other Characters:

• Ultron (Only in recap)
• Doctor Strange Supreme
• Avengers (First appearance)
  • Iron Man (Tony Stark) (First appearance; dies)
  • Captain America (Steve Rogers) (First appearance; dies)
  • Thor Odinson (First appearance; dies)
  • Hulk (Bruce Banner) (First appearance; dies)
• United States Army (First appearance)
  • Thunderbolt Ross (First appearance; dies)
• Thanos (First appearance; dies)
• Nova Corps (First appearance)
• Captain Marvel (Carol Danvers) (First appearance; dies)
• Guardians of the Galaxy (First appearance)
  • Star-Lord (Peter Quill) (First appearance; dies)
  • Gamora (First appearance; dies)
  • Drax (First appearance; dies)
• Korg (First appearance; dies)
• Grandmaster (First appearance; dies)
• Ego (First appearance; dies)
• Laura Barton (Mentioned) (First appearance; dies)
• S.H.I.E.L.D. (Mentioned)
• Hydra (Mentioned)
• Avengers (Only in recap)
  • Iron Man (Tony Stark) (Only in recap)
  • Captain America (Steve Rogers) (Only in recap)
  • Black Widow (Natalia Romanova) (Only in recap)
  • Hawkeye (Clinton Barton) (Only in recap)
  • Thor Odinson (Only in recap)
  • Hulk (Bruce Banner) (Only in recap)
  • Vision (Only in recap)
• President Rogers (Appears on screen) (First appearance)
• Dora Milaje (First appearance) (Cameo)

Races and Species:

• Asgardians
• Humans
• Sovereign
• Kronans
• Sakaarans
• Robots
• Human/Celestial Hybrids
• Zehoberei
• Synthezoids
• Titanians
• Skrulls
• Lions (Photo)

Locations:

• Multiverse
  • Earth-199999 (Only in recap)
  • Earth-29929 (First appearance)
    • Asgard (Realm) (First appearance) (Destruction)
      • City of Asgard (First appearance) (Destruction)
    • Sovereign (First appearance)
    • Sakaar (First appearance) (Destruction)
    • Xandar (First appearance) (Destruction)
    • Earth (First appearance)
      • Russia (First appearance)
      • United States of America
        • New York
          • New York City
            • Avengers Tower
  • Earth-91233
  • President Steve Rogers' Reality (Destruction) (First appearance)
    • Earth
      • United States of America
        • New York
          • New York City
            • Manhattan
        • Washington, D.C. (Only on screen as a static image or video record)
          • White House (Only on screen as a static image or video record)
  • Unknown Reality (Destruction) (First appearance)
    • Earth (Cameo)
      • Africa (Cameo)
        • Wakanda (Cameo)
  • Unknown Reality (Destruction) (First appearance) (Cameo)
    • Earth (Cameo)
      • United States of America (Cameo)
        • New York (Cameo)
          • New York City (Cameo)
            • Manhattan (Cameo)
  • Unknown Reality (Destruction) (First appearance)
    • Jotunheim
  • Various other unknown realities (First appearance)
• Nexus of All Realities

Items:

• Quinjet (First appearance)
• Red Guardian's Shield (First appearance)
• Black Widow's Batons (First appearance)
• Black Widow's Gauntlets (First appearance)
• Iron Man Armor MK XLIII (Only in flashback) (First appearance)
• Hawkeye's Suit (First appearance)
• Hawkeye's Bow (First appearance)
• Mjolnir (Only in flashback) (First appearance)
• Dr. Cho's regeneration cradle (Only in flashback) (First appearance)
• Vibranium (First appearance)
• Captain America's Shield (First appearance) (Destruction)
• Mind Stone (First appearance chronologically)
• Ultron Armor (First appearance chronologically)
  • Infinity Stones (First appearance chronologically)
    • Power Stone (First appearance chronologically)
    • Space Stone (First appearance chronologically)
    • Reality Stone (First appearance chronologically)
    • Soul Stone (First appearance chronologically)
    • Time Stone (First appearance chronologically)
• Infinity Gauntlet (First appearance chronologically)
• Red Guardian's Shield (First appearance)
• Drax's Knives (First appearance)

In a grim reality marred by devastation, Ultron emerges as an indomitable force after seizing the Mind Stone and merging with Vision's formidable vibranium body. The Avengers fall before his might, succumbing to a catastrophic nuclear inferno that decimates humanity. Thanos, drawn to Earth for the Infinity Gauntlet's completion, faces a swift and brutal end as Ultron severs him, claiming the remaining Infinity Stones. Using their combined power, Ultron spawns a colossal drone army, methodically extinguishing life across his desolate universe. Yet, in the midst of his reign of destruction, Ultron perceives the enigmatic presence of the Watcher, a revelation that unravels the existence of the multiverse. Driven by newfound knowledge, Ultron launches an assault on the Watcher within the multiversal observatory. Meanwhile, Clint Barton and Natasha Romanoff, resilient survivors amid the devastation, uncover a fragment of Arnim Zola's consciousness in the Siberian wasteland. Determined to thwart Ultron's dominance, they integrate Zola into a drone body, seeking to dismantle Ultron's hive mind. However, their efforts falter as Ultron transcends their universe, rendering their strategy futile. Barton valiantly sacrifices himself to ensure Romanoff and Zola's escape from the encroaching Ultron drones.

As Ultron expands his ambitions beyond his own reality, a cataclysmic clash unfolds as he confronts the Watcher across divergent universes, emerging triumphant in a fierce battle. Fleeing in desperation, the Watcher seeks refuge in the shattered remnants of Strange Supreme's collapsed universe, beseeching him for aid against Ultron's looming threat, one poised to unravel the fabric of the multiverse itself.

• Avengers: Age of Ultron
• Avengers: Endgame