> ## Content Index > Fetch the complete content index at: https://www.agamingnetwork.com/llms.txt > Use this file to discover other available public pages before exploring further. # MARVEL Cosmic Invasion: The Siege of Castle Doom DLC Revealed for Fall 2026 - URL: https://www.agamingnetwork.com/marvel-cosmic-invasion-siege-of-castle-doom-dlc/ - Published: 2026-08-17T19:00:00.000Z - Updated: 2026-08-18T06:11:47.000Z - Author: Marcel Dee - Tags: News, Made In Canada Doctor Doom is ready to make his presence felt in **MARVEL Cosmic Invasion**. Publisher **Dotemu** and developer **Tribute Games** have revealed the first look at **MARVEL Cosmic Invasion: The Siege of Castle Doom**, an upcoming premium DLC expansion for the D.I.C.E. Awards-nominated arcade-style tag-team beat ’em up. Launching in **Fall 2026**, The Siege of Castle Doom will bring an all-new game mode, two new playable characters, and a major new focus on one of Marvel’s most infamous villains: **Doctor Doom**. The DLC will be available on PC via Steam, Nintendo Switch, Nintendo Switch 2, PlayStation 4, PlayStation 5, and Xbox Series X|S. ## Doctor Doom Takes Center Stage The big hook for The Siege of Castle Doom is right in the title. Doctor Doom will be central to this new DLC, putting one of Marvel’s most iconic villains at the heart of MARVEL Cosmic Invasion’s next major expansion. While Dotemu and Tribute Games are keeping many details under wraps for now, the reveal confirms that Castle Doom will play a major role in the new content. For a game built around classic Marvel energy, over-the-top comic book action, and arcade-inspired chaos, Doctor Doom feels like a perfect fit. His presence opens the door for darker stakes, bigger battles, and a more villain-focused challenge for players to take on. ## A New Game Mode Is Coming Alongside Doctor Doom’s ominous arrival, The Siege of Castle Doom will introduce an all-new game mode. Full details have not been revealed yet, but this new mode should give players another reason to return to MARVEL Cosmic Invasion beyond the main campaign. The base game already leans heavily into replayable arcade action, co-op play, and character experimentation, so a new mode could expand that structure in a meaningful way. Whether it focuses on survival, challenge rooms, boss rush gameplay, or something entirely different, the addition of a new mode gives the DLC more weight than a simple character pack. ## Two New Playable Characters Will Join the Roster The Siege of Castle Doom will also add **two new playable characters** to MARVEL Cosmic Invasion. Dotemu and Tribute Games have not revealed who those characters are yet, but the Doctor Doom theme will likely fuel plenty of fan speculation. MARVEL Cosmic Invasion already features a large roster of heroes from across Earth and the cosmos, so the next additions could pull from many different corners of Marvel history. The mystery around the new characters gives players something to watch closely as more updates arrive leading into Fall 2026. ## MARVEL Cosmic Invasion Continues to Expand MARVEL Cosmic Invasion has been one of the strongest modern examples of a classic arcade beat ’em up. The game features a playable roster of **17 Super Heroes** and uses the **Cosmic Swap** system, allowing players to tag between two characters during fights. This tag-team structure gives players the freedom to mix abilities, create different pairings, and experiment with combat styles across each stage. The story follows the immortal Super Villain **Annihilus**, who launches a galaxy-wide assault with the Annihilation Wave. To stop him, Earth-born and cosmic heroes must join forces against threats that include Thanos, M.O.D.O.K., Taskmaster, and other dangerous enemies. With The Siege of Castle Doom, Dotemu and Tribute Games are adding another major Marvel threat to the spotlight. ## A Modern Beat ’Em Up With Classic Marvel Energy Dotemu and Tribute Games have already proven they understand the appeal of arcade-style brawlers. After the success of **Teenage Mutant Ninja Turtles: Shredder’s Revenge**, the two teams brought that same love of classic co-op action to the Marvel universe. MARVEL Cosmic Invasion celebrates the golden eras of Marvel storytelling with bright pixel art, fast-paced combat, and character designs that feel pulled from classic comics and animated entertainment. The result is a game that feels nostalgic without feeling stuck in the past. It captures the spirit of old-school arcade cabinets while using modern design ideas like tag-team combat, replayable character combinations, and more flexible co-op action. ## Why Castle Doom Matters Doctor Doom is not just another Marvel villain. He is one of the most important characters in the entire Marvel universe. As the ruler of Latveria, a master of science, and a powerful sorcerer, Doom brings a unique blend of intelligence, arrogance, technology, and magic. Putting him at the center of a new MARVEL Cosmic Invasion DLC gives the game a chance to shift its tone and scale. The base game focuses on a cosmic war against Annihilus. The Siege of Castle Doom could bring that action into a more focused villain stronghold, giving players a new kind of challenge built around Doom’s world, his power, and whatever threat he is preparing. ## Platforms MARVEL Cosmic Invasion: The Siege of Castle Doom launches in Fall 2026 on: - PC via Steam - Nintendo Switch - Nintendo Switch 2 - PlayStation 4 - PlayStation 5 - Xbox Series X|S ## Final Thoughts MARVEL Cosmic Invasion: The Siege of Castle Doom sounds like a strong next step for Dotemu and Tribute Games’ arcade-style Marvel brawler. With Doctor Doom taking center stage, a new game mode on the way, and two mystery playable characters joining the roster, this premium DLC has the potential to give fans a major reason to return to the fight. MARVEL Cosmic Invasion already delivers the kind of fast, colourful, tag-team action that feels right at home in an arcade. Now, with Castle Doom looming in the distance, the game’s next chapter looks ready to bring even more comic book chaos to the screen.