Ethan Crossfield 
Licensed games often become a key part of a franchise's momentum around major screen releases, giving fans fresh ways to engage with familiar characters between trailers and premieres. Marvel Cosmic Invasion is taking that route with Siege of Castle Doom, an expansion centered on Doctor Doom that launches shortly before Avengers: Doomsday reaches theaters.
A new challenge inside Doomstadt
Tribute Games will release Siege of Castle Doom on November 10. The DLC introduces a new mode built around Castle Doomstadt, the Latverian stronghold associated with Doctor Doom. Players will push through the castle toward a confrontation with Doom, facing both returning opponents and new enemy types along the way. The mode will also introduce new modifiers, adding another layer to its run-based challenges. The expansion is priced at $7.99 and includes Doctor Doom and Invisible Woman as unlockable playable characters.
The Fantastic Four roster grows
Marvel Cosmic Invasion launched in 2025 with 15 playable heroes, blending headline names such as Spider-Man, Captain America, and Iron Man with less conventional choices including Cosmic Ghost Rider and Phyla-Vell. Its first DLC additions in 2026 brought Cyclops and the Thing into the lineup. Cyclops joined fellow X-Men Wolverine, Phoenix, and Storm, while the Thing became the first playable member of the Fantastic Four. Invisible Woman's arrival means only Mr. Fantastic and Human Torch remain absent from the core Fantastic Four team.
What could come after Siege of Castle Doom
Tribute Games has not confirmed any content beyond this expansion, so further additions remain uncertain. Community discussion following the reveal has highlighted Mr. Fantastic, Human Torch, and Deadpool as requested characters, while names such as Thor, Gambit, and Blade also fit the game's wide Marvel pool. Deadpool joined Marvel Rivals earlier in 2026, but there is no indication that he is planned for Marvel Cosmic Invasion. For now, Doom's DLC gives the game a timely spotlight as Avengers: Doomsday approaches its December 18 theatrical release.
Key points
- Siege of Castle Doom launches on November 10 for $7.99.
- The DLC adds a Castle Doomstadt-focused mode with modifiers and enemy encounters.
- Doctor Doom and Invisible Woman are included as playable unlocks.
- Mr. Fantastic and Human Torch are the remaining Fantastic Four members not yet playable.
Confirmed Marvel Cosmic Invasion additions
| Update | Confirmed content | Timing |
|---|---|---|
| First DLC batch | Cyclops and the Thing | Earlier in 2026 |
| Siege of Castle Doom | New mode, Doctor Doom, and Invisible Woman | November 10 |
| Avengers: Doomsday | Doctor Doom's major MCU role | December 18 |
Expert View
The expansion shows how Marvel can use game updates to extend attention around its biggest characters without relying solely on film marketing. Doctor Doom is a strong fit for a mode-driven DLC because his castle provides a clear setting, enemy theme, and final encounter. If Siege of Castle Doom performs well, demand for the remaining Fantastic Four members could become a practical signal for whether Marvel Cosmic Invasion receives another round of character content.
