Marvel Cosmic Invasion is a fantastic brawler from Tribute Games and Dotemu that takes little bits and pieces from various Marvel fighters and brawlers over the decades and combines them into a single, engaging package. The game has released a handful of DLC drops in the time since its launch back in December of 2025, but one the most substantial yet involves everyone’s favorite Latverian despot. The Siege of Castle Doom is a paid expansion coming to Cosmic Invasion this fall:
The gates are opening, and a new battle is about to begin. 🏰💥
— Tribute Games (@TributeGames) August 17, 2026
Prepare to face the wrath of Doctor Doom in an all-new DLC for MARVEL Cosmic Invasion, featuring a brand-new game mode and two additional playable characters!
Are you ready to face the threats behind the walls of… pic.twitter.com/SwNA1SQQJd
As the Dotemu press release puts it, fans looking forward to the film Avengers: Doomsday “will have a bit of fun with this update” when it launches. The Siege of Castle Doom promises “an all-new game mode arriving alongside two new playable characters.” Who might those characters be? It would be nice to see the Fantastic Four roster get closer to completion, and who would say no to Thor himself appearing? There are a ton of Marvel characters that would be fun to see make an appearance in Cosmic Invasion, so why not share your picks down below?
Source: Tribute Games X Account + Dotemu Press Release