Introduction
MARVEL Cosmic Invasion: The Siege of Castle Doom is a premium DLC for MARVEL Cosmic Invasion, announced in Paris on August 17, 2026. The expansion is scheduled for fall 2026 and will introduce a new game mode and two new playable characters, with Doctor Doom at the center of the expansion. The base game has already reached more than 1.5 million players.
MARVEL Cosmic Invasion: The Siege of Castle Doom Announced
Publisher Dotemu and developer Tribute Games revealed The Siege of Castle Doom on August 17, 2026, alongside the first teaser image for the DLC.
The expansion continues the Marvel-themed tag-team cooperative beat ’em up experience of MARVEL Cosmic Invasion. The DLC focuses on Doctor Doom and adds new content to the existing game.
The base game features 17 playable superheroes, while the upcoming DLC will add two additional playable characters.
Key Details and Features of the DLC
The main confirmed details for MARVEL Cosmic Invasion: The Siege of Castle Doom include:
- DLC: MARVEL Cosmic Invasion: The Siege of Castle Doom
- Type: Premium DLC
- Announcement date: August 17, 2026
- Announcement location: Paris
- Release window: Fall 2026
- Main character: Doctor Doom
- New playable characters: 2
- New game mode: Included
- Base game players: More than 1.5 million
- Base playable superheroes: 17
- Combat system: Cosmic Swap
- Platforms: PC, Steam, Nintendo Switch, Nintendo Switch 2, PlayStation 4, PlayStation 5, and Xbox Series X|S
The Cosmic Swap system allows players to switch between characters during combat and combine their abilities through two-character combinations.
Doctor Doom and the Threat Facing the Heroes
Doctor Doom is the central character associated with The Siege of Castle Doom. The expansion adds new content to a game whose existing threats include Annihilus, Thanos, M.O.D.O.K., and Taskmaster.
The game also features the Annihilation Wave led by Annihilus. Annihilus and allied forces serve as hostile forces within the game’s conflict.
The addition of Doctor Doom gives the DLC a new central focus while expanding the game’s playable character roster and gameplay options.
Platforms and Official Updates
MARVEL Cosmic Invasion: The Siege of Castle Doom is scheduled to arrive in fall 2026 for PC and consoles.
The announced platforms are:
- PC
- Steam
- Nintendo Switch
- Nintendo Switch 2
- PlayStation 4
- PlayStation 5
- Xbox Series X|S
Further official updates are available through the game’s official website and the official X accounts of Dotemu and Tribute Games.
Dotemu and Tribute Games
MARVEL Cosmic Invasion is published by Dotemu and developed by Tribute Games, a Montreal-based studio that began its activities in 2011.
Dotemu’s related games include Teenage Mutant Ninja Turtles: Shredder’s Revenge, Absolum, Streets of Rage 4, and NINJA GAIDEN: Ragebound. Dotemu also has projects including Warhammer Age of Sigmar: Deathmaster and Theos: Cities of Myth, with projects planned for 2026 and beyond.
Tribute Games’ development history includes Wizorb, Mercenary Kings, Curses ‘N Chaos, Ninja Senki DX, Flinthook, and Panzer Paladin. The studio also worked on Teenage Mutant Ninja Turtles: Shredder’s Revenge in cooperation with Dotemu and Nickelodeon.
Conclusion
MARVEL Cosmic Invasion: The Siege of Castle Doom is a premium DLC planned for fall 2026. Announced on August 17, 2026, the expansion centers on Doctor Doom and adds a new game mode plus two new playable characters. With MARVEL Cosmic Invasion having already surpassed 1.5 million players, the DLC expands the game’s tag-team cooperative beat ’em up experience through its Cosmic Swap character-switching system.
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