On November 11, H2 Interactive officially released the new DLC "The Siege of Castle Doom" for the Korean version of the side-scrolling beat 'em up game MARVEL Cosmic Invasion. The target platforms are PS4, PS5, Nintendo Switch, and Nintendo Switch 2.
This DLC adds a run-based action mode where players progress through challenges across individual runs. By collecting battery cells and completing challenges, players can obtain upgrades across 12 perks that enhance defense, attack power, and tactical abilities. Susan Storm of the Fantastic Four and Doctor Doom join as new playable characters.
At the center of the story is the Cosmic Inductor, a weapon created to stop Annihilus. However, due to a fatal flaw, the weapon poses a threat of bringing doom to the entire universe. The player's goal is to breach Victor von Doom's fortress and stop him before he activates the weapon. Each time players survive combat, a stabilizer developed by Reed Richards of the Fantastic Four charges up, serving as a key tool to thwart Doctor Doom's scheme.
Inside the fortress, players advance by choosing buffs that enhance or alter their movement routes and combat capabilities. In addition to Doombots and traps placed throughout, bosses from the base game stand in the player's way. Regardless of path and perk choices, enemies grow stronger as the Siege Gauge fills up. If the gauge fills completely before reaching Doctor Doom, the run immediately fails.
The results of each run also affect subsequent play. Upon success, players can permanently unlock new equipment and events in Reed's Lab, as well as modifiers that increase difficulty in exchange for greater rewards. If a run fails, a debuff is applied to the player's character.
Players who defeat Doctor Doom can unlock new color palettes for all playable superheroes. An original soundtrack composed by Tee Lopes has also been added with this DLC.
