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Marvel Cosmic Invasion’s The Siege of Castle Doom DLC is scheduled for November 10, 2026, according to Tribute Games’ October 26 PlayStation announcement. It introduces Doctor Doom and Invisible Woman as playable characters alongside a mode built around changing runs through Doom’s castle.
How the new mode changes a run
In the developer’s reveal, defeats build a Siege Gauge, while victories supply batteries for a Stabilizer that slows Doom’s progress. Themed doors offer equipment, events, healing, infinite-resource power-ups or progression.
Perks have Offense, Defense and Tactical branches and apply individually to heroes. Stabilizers also lead to Reed Richards’ Lab, where additional equipment, events and modifiers can be unlocked. Completing a run unlocks a character palette.
What that means for co-op planning
Our reading is that route selection and build coordination are the central changes to watch. A group should discuss whether it needs recovery or another upgrade before committing to a route. That is an approach suggested by the announced systems, not a tested strategy or a claim about the strongest combination.
It also gives returning players a useful question before buying: do you want more repeated runs with changing decisions, or are you mainly looking for a new character? Those preferences can lead to different expectations of the same add-on.
Platforms and multiplayer context
PlayStation’s base-game listing covers PS4 and PS5 and lists one to four players, with PlayStation Plus required for online multiplayer. It describes the original game’s Cosmic Swap system as choosing two heroes and switching between them during a level.
Those base-game details provide context; they should not be treated as a separate confirmation of every DLC platform, crossplay option or purchase entitlement. Check the add-on listing for your platform when it becomes available.
Is a DLC price confirmed?
The cited gameplay announcement does not state a price. Check the exact add-on and edition contents before paying; the base game’s price is not the DLC price.
Checked October 27, 2026. This is an announcement explanation, not a hands-on preview. Find more PlayStation coverage on New Game Wire.
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