Over 1.5 million players have already enjoyed Marvel Cosmic Invasion from Tribute Games and Dotemu. With the release of the second DLC, The Siege of Castle Doom, this figure is set to increase.
Although Avengers: Doomsday won't be in cinemas until 16 December 2026, but Tribute Games and Dotemu are already banking on Doctor Doom being the main attraction in the second DLC for Marvel Cosmic Invasion. This DLC is titled The Siege of Castle Doom and will be released a month before the film's theatrical release.
The first DLC featured just two playable characters: Cyclops and The Thing. The Siege of Castle Doom is more extensive. It introduces a new game mode, Castle Doom, and features two new characters: the Fantastic Four's Susan Storm (the Invisible Woman) with her light-bending and force field manipulation powers, and Doctor Doom with his high-powered tech armour. It also includes new unlockable colour palettes for all playable Super Heroes who successfully defeat Doctor Doom, as well as new original musical tracks by composer Tee Lopes.
Fantastic Four's Susan Storm & Doctor Doom © Dotemu, Tribute Games, Marvel Games
However, the key feature is the Castle Doom game mode. This is not a traditional story mode or a survival mode, but a run-based mode that essentially functions as a roguelite. Convinced that he can defeat Annihilus and save the galaxy alone, Victor Von Doom built the Cosmic Inductor: a powerful yet unstable weapon that threatens Earth's safety. In Castle Doom, players must break through the defences of Victor Von Doom's stronghold before he can activate the Cosmic Inductor. Each encounter that the player survives will charge the Stabiliser, a creation of the Fantastic Four's Reed Richards. During runs, players gather Battery Cells and complete challenges to earn defensive, offensive or tactical upgrades from a collection of twelve different perks. However, failing challenges will weaken their fighters, and there are traps set by Doctor Doom. As is typical of roguelites, successful runs will help to permanently unlock new equipment and events from Reed's Lab, as well as modifiers that can increase the difficulty and potential rewards available in future attempts.
There are plenty of choices even during the run itself. Players can make their way through Castle Doom (or Doomstadt), choosing between different doors and paths that offer different bonuses at the end, which are visible before entering each room. There, they will encounter new threats in the form of hordes of Doom Bots, as well as returning bosses from the base game. No matter which path they take or which perks they choose, players must ensure they reach Victor von Doom before the Siege Gauge (bottom right) is full. As the gauge rises, the castle's forces grow stronger. However, if it is completely full before you reach the final battle against Victor von Doom, the run ends immediately. New voice recordings have also been added to enhance the atmosphere. Reed Richards will accompany and advise players via radio during the run, while Doctor Doom will regularly taunt the intruders.
Marvel Cosmic Invasion: The Siege of Castle Doom © Dotemu, Tribute Games, Marvel Games
Marvel Cosmic Invasion: The Siege of Castle Doom and the main game were developed by Tribute Games. This Montreal-based studio was founded in May 2011 by former Ubisoft employees Jonathan Lavigne and Jean-François Major. Both Lavigne and Major worked on Teenage Mutant Ninja Turtles for the Game Boy Advance, as well as Scott Pilgrim vs. the World, among other titles. The studio released its first title, Wizorb, for the Xbox 360 in September 2011. This was followed by Mercenary Kings, Curses 'N Chaos, Ninja Senki DX, Flinthook, and Panzer Paladin. They are also the developers of the million-selling Teenage Mutant Ninja Turtles: Shredder's Revenge (2022), published by Dotemu in partnership with Nickelodeon. They also developed Scott Pilgrim EX (2026).
The game's publishers are Dotemu, as well as Gamirror Games in China and other Chinese-speaking regions. The French company is part of Pullup Entertainment and specialises in revitalising legendary pop culture franchises across video games, TV, and cinema by releasing original PC and console games. Dotemu has developed and published several global top-sellers, including Teenage Mutant Ninja Turtles: Shredder's Revenge, Streets of Rage 4, and Ninja Gaiden: Ragebound, as well as their first IP, Absolum, which sold over 200,000 copies in its first week. Dotemu's development and publishing work has also supported the release of the critically acclaimed Metal Slug Tactics, Windjammers 1 and 2, Pharaoh: A New Era, Wonder Boy: The Dragon's Trap and more. In 2026, Starship Troopers: Ultimate Bug War!, Battlestar Galactica: Scattered Hopes, Blasterbug: Last Bug Standing! and Theos: Cities Of Myth have been released.
Marvel Cosmic Invasion: The Siege of Castle Doom launched on 10 November 2026 for PC (via Steam), Nintendo Switch, PlayStation 4 and 5, and Xbox Series X|S.
Thanks to the stunning Castle Doom mode, The Siege of Castle Doom is the best and most extensive expansion for Marvel Cosmic Invasion yet.
