Marvel Cosmic Invasion’s The Siege of Castle Doom DLC planned for Nov. 10 with branching new mode

Tribute Games level designer Kevin Chiasson describes Castle Doom as a new mode in Marvel Cosmic Invasion’s The Siege of Castle Doom DLC, planned for Nov. 10, 2026. Players will choose doors for powers, healing or batteries while losses raise a Siege Gauge and victories help stall Doctor Doom. Reed Richards’s Lab offers unlocks for later runs. The DLC is also slated to add the Invisible Woman and Doctor Doom as playable characters.