Marvel Cosmic Invasion: The Siege of Castle Doom, the game’s second paid DLC, launches on Tuesday, November 10, 2026. It adds two playable characters, Doctor Doom and the Invisible Woman, and it also includes a new Doctor Doom game mode set in Castle Doomstadt. However, the publisher has not announced a price as of October 13, 2026, and it has not published the full movesets. In the meantime, PC players can check the requirements on Steam.
Summary: Marvel Cosmic Invasion: The Siege of Castle Doom
- Release date: Tuesday, November 10, 2026.
- New characters: Doctor Doom and the Invisible Woman, in the game’s second paid DLC.
- New mode: a Doctor Doom mode set in Castle Doomstadt.
- Platforms: PC (Steam), Switch, Switch 2, PS4, PS5 and Xbox Series X|S. Xbox One is unconfirmed.
- Roster: 19 playable characters after the DLC (reported).
- Not confirmed: price, movesets and the new mode’s details.
What The Siege of Castle Doom adds
Marvel Cosmic Invasion is Tribute Games’ tag-team co-op beat ’em up, and it launched on December 1, 2025. The Siege of Castle Doom is its second paid expansion. For example, the first one arrived in May 2026 and added Cyclops and The Thing for $3.99.
In total, the new pack has three confirmed pieces:
- Doctor Doom. Specifically, the publisher says he fights with high-powered tech armor of his own design, occult skills and his intellect.
- The Invisible Woman. Susan Storm brings light-bending powers and force field manipulation, and the announcement also says her abilities are new to the game.
- A Doctor Doom game mode. It takes place in Castle Doomstadt, which the Steam page calls the headquarters of Victor Von Doom.
According to one report, both characters have full voice acting, their own movesets and compatibility with every hero already in the game. Because the roster stands at 17 after the first DLC, the two new fighters should bring it to 19.
The timing is deliberate, because Avengers: Doomsday reaches theaters on December 18. As a result, Marvel games are leaning into Doom this season.
Release date, platforms and price
| Stage | What happened |
|---|---|
| First DLC | Cyclops and The Thing released in May 2026 for $3.99 |
| DLC 2 announced | Mid-August 2026, as a new Doctor Doom mode for fall |
| Characters and date revealed | October 8, 2026, at New York Comic Con |
| Launch | Tuesday, November 10, 2026 |
Most coverage lists the DLC for PC via Steam, Nintendo Switch, Nintendo Switch 2, PlayStation 4, PlayStation 5 and Xbox Series X|S. However, one outlet also lists Xbox One. The base game runs on Xbox One, but I could not confirm the DLC for it, so check the Xbox store page before you plan around it. Also, I could not find a launch time, so check your store on November 10.
Price is the big unknown. Neither the publisher nor the Steam page has posted one. For instance, the Steam page shows the DLC as not yet available, with an unlock date of November 10. In addition, some outlets guess it will match the first pack at $3.99, but that is speculation, not an announcement. Meanwhile, the base game costs $29.99 on Steam, and the DLC requires it.
What we know about the movesets
The publisher says Doctor Doom and the Invisible Woman have unique voice lines and movesets, but it has not published move lists, special attacks or tag-team interactions. So here is exactly where things stand:
| Confirmed | Not announced | |
|---|---|---|
| Doctor Doom | Tech armor, occult skills, intellect | Attacks, specials, how he plays |
| Invisible Woman | Light bending, force fields | Attacks, specials, how she plays |
| Both | Unique voice lines and movesets | Tag-team pairings and combos |
Any article that lists their individual moves right now is guessing. In fact, the trailer from New York Comic Con is the only gameplay evidence so far, and the written announcements describe it only in general terms.
Base game context helps here. Each hero has a distinct moveset, and the tag-team system lets you swap between your two characters mid-fight. Therefore, expect the two new fighters to follow the same pattern, but treat that as an expectation until the DLC arrives.
The Doctor Doom game mode
The new mode puts Doom at the center and takes place in Castle Doomstadt. However, the publisher says only that more details on its gameplay and premise are coming soon. As of October 13, nothing confirms the stages, bosses, length or whether it supports the same four-player drop-in, drop-out co-op as the main game.
PC system requirements
On the PC side, the Steam page for the DLC lists these Windows requirements:
| Minimum | Recommended | |
|---|---|---|
| OS | Windows 10, 64-bit | Windows 10, 64-bit |
| Processor | Intel Core 2 Duo E6550 or Athlon 64 X2 6400+ | Intel Core i3-540 or AMD Phenom II X2 550 |
| Memory | 4 GB RAM | 8 GB RAM |
| Graphics | GeForce GT 320 (1 GB), Radeon HD 6570 (1 GB) or Intel HD Graphics | GeForce GT 730 (2 GB), Radeon R7 240 (2 GB) or Intel HD Graphics |
| Storage | 1 GB | 1 GB |
| Target | 1080p at 30 FPS | 1080p at 60 FPS |
Steam also lists SteamOS and Linux requirements, and the minimum there is higher (8 GB of RAM and a GT 1030-class GPU).
However, no Switch 2 system requirements exist. Consoles do not list PC-style specs, and the publisher has announced nothing Switch 2-specific for the DLC beyond the platform listing.
How to get it on launch day
- Own the base game. First, make sure you own it, because Steam says the DLC requires Marvel Cosmic Invasion.
- Open your store page on November 10. The page currently shows the DLC as not yet available, so check it again on launch day.
- Do not plan around a price. Because the publisher has announced none, check the listing when it unlocks.
- Check your platform. If you are on Xbox One, confirm the DLC appears in the store before you buy.
- Update the game. Finally, download any patch before you start the new mode.
Tips and common mistakes
Calling it the first DLC. Some coverage does. However, it is the second, after Cyclops and The Thing.
Assuming the price. $3.99 is the first pack’s price, so do not treat it as a confirmed price for this one.
Searching for Switch 2 requirements. They do not exist as a spec sheet, so the PC list above is the only official hardware list.
Using the wrong name. The title is The Siege of Castle Doom. For example, one outlet wrote it as Siege of Doom’s Castle.
Expecting move lists now. The publisher has not released them, so wait for launch footage.
As a practical tip for co-op, plan to test the new characters in several pairings, because they reportedly work with the existing roster. In addition, if you want more Marvel Doom coverage, our Marvel Rivals Season 10.5 patch notes cover its Path to Doomsday modes. Meanwhile, Risk of Rain 2 is also adding a DLC character this fall, and our Enforcer guide covers his skills. For another paid expansion on the calendar, see our Dragon’s Dogma 2 Dark Arisen guide. Finally, for more PC requirements, browse our Specs section.
What could change
Price, launch time, platform availability, the mode’s details and the movesets are all still open. However, everything here is accurate as of October 13, 2026, based on the announcements, the Steam page and the outlets checked. For final details, look at the official store pages and Dotemu’s announcements.
Conclusion
The Siege of Castle Doom launches November 10 with Doctor Doom, the Invisible Woman and a Castle Doomstadt mode. Although the PC requirements are public and light, the price, the mode’s details and the individual movesets are not. Therefore, check your store page on launch day, and treat any move list or price you see before then as a guess.
FAQs
When does The Siege of Castle Doom come out?
Tuesday, November 10, 2026.
How much does it cost?
No price has been announced as of October 13, 2026, so check the store page on launch day.
Who are the new characters?
Doctor Doom and the Invisible Woman.
What platforms is it on?
PC via Steam, Switch, Switch 2, PS4, PS5 and Xbox Series X|S. However, Xbox One is unconfirmed.
Do I need the base game?
Yes, because Steam says the DLC requires Marvel Cosmic Invasion.
Are there Switch 2 system requirements?
No, because the publisher has released only PC requirements.
For more updates visit: GAME SPEC
