The Mad Titan has succeeded, all five Infinity Stones reside within his gauntlet and the most powerful weapon in the universe is under Thanos' control! In a desperate attempt to gain the upper hand the Avengers look to rebuild Arsenal, could the mechanical maniac Ultron prove to be the final piece of the puzzle or an even greater threat than Thanos!?

Episodes:
The Age of tony Stark
Head to Head
The Dark Avengers
Back to the Learning Hall
Downgraded
Widow's Run
Thanos Triumphant