Marvel Cosmic Invasion Adding 'The Siege of Castle Doom' DLC This Fall

By Rizwan Ahmed, Senior Writer Published Aug 18, 2026, 2:26 PM UTC 1 min read

Deep Explainer Details verified Verified reporting

Marvel Cosmic Invasion Adding 'The Siege of Castle Doom' DLC This Fall

Tribute Games has announced a new major expansion for Marvel Cosmic Invasion titled The Siege of Castle Doom. The premium downloadable content is scheduled for release later this fall on PlayStation 5.

The expansion is designed to coincide with the upcoming release of the film Avengers: Doomsday, which arrives in theaters this December. According to the developer, the content will introduce an all-new game mode centered on the antagonist Doctor Doom, alongside two additional playable characters.

Quick Facts

Title: The Siege of Castle Doom
Game: Marvel Cosmic Invasion
Platform: PlayStation 5
Release Window: Fall 2026
Content: New game mode and two new playable characters

This update follows previous additions to the title, including the release of Cyclops and The Thing as DLC earlier in May 2026. While Tribute Games has not yet disclosed pricing or released gameplay footage for this specific expansion, the studio previously teased that “fresh challenges” were in development for the game earlier this year.