Marvel Cosmic Invasion DLC Unveils New Game Mode

Marvel Cosmic Invasion is getting The Siege of Castle Doom DLC next month, and a new mode for it has now been revealed.

In the new mode, you have to stop Doctor Doom's latest invention before he can use it to destroy the galaxy. You're racing a clock as the Siege Gauge fills.

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Doctor Doom's stronghold is the setting. You have to break through its defenses before Victor von Doom can activate the Cosmic Inductor, a flawed weapon originally built to stop Annihilus that now threatens the whole cosmos.

Each encounter you survive charges the Stabilizer, a device built by Reed Richards that can stop Doom's plan. Collect Battery Cells and complete challenges to earn upgrades from a set of 12 perks. Failing challenges weakens your fighters, and Doom has set traps for you along the way.

Successful runs unlock new equipment and events from Reed's Lab, along with modifiers that make later attempts harder and more rewarding. The castle's routes branch, so you choose your path and your buffs. Doom Bots guard the castle, and bosses from the base game are waiting to settle scores.

Reach Victor von Doom before the Siege Gauge fills. The castle's forces get stronger as it fills, and if it fills completely before your showdown, the run ends.

The DLC also adds Susan Storm and Doctor Doom as playable characters, new color palettes for any hero who defeats Doctor Doom, and original music from composer Tee Lopes. A trailer for the new mode is available on the site.

The DLC will be out for Nintendo Switch 2 and Switch on November 10, 2026. You can read our Marvel Cosmic Invasion review while you wait.