Concerns about Ultron's Return in the MCU
The Marvel Cinematic Universe is known for its interconnectivity, with major characters making unexpected appearances in various movies.
This approach was first seen when Robert Downey Jr. appeared in The Incredible Hulk, and has since become a staple of the franchise, with villains like Samuel Sterns returning 17 years after their initial appearance.
Notable examples include Tom Hiddleston's Loki, who has appeared multiple times throughout the franchise, showcasing the MCU's ability to bring back characters in unexpected ways.
The Marvel Cinematic Universe has always been built around its interconnectivity.
Author's summary: Ultron's return may ruin the Avengers villain.