Marvel Cosmic Invasion DLC Siege of Castle Doom Announced — Doctor Doom Arrives This Fall
Tribute Games and publisher Dotemu have announced a paid expansion for Marvel Cosmic Invasion titled The Siege of Castle Doom.
The brawler, which launched in December 2025, has received multiple content drops since release; this new expansion was revealed via Tribute Games social channels on August 17, 2026 and is scheduled to arrive in fall 2026.
Background and developer context
Marvel Cosmic Invasion is a contemporary beat em up that blends mechanics and character archetypes from decades of Marvel brawlers.
The project is developed by Tribute Games with publishing and promotional support from Dotemu.
Both companies are recognized for work in retro-inspired 2D action and brawler design, and Cosmic Invasion continued that focus when it launched in December 2025 and followed up with several DLC releases.
What The Siege of Castle Doom includes
According to the announcement, The Siege of Castle Doom will center on Doctor Doom and introduce a new game mode plus two additional playable characters.
Tribute Games used social media to frame the expansion as a Castle Doom-focused confrontation with Doom at its center; in journalistic terms, the studio said the update will position players to confront Doctor Doom inside a fortified new area that expands the game's combat scenarios.
Dotemu issued a press release accompanying the announcement and noted that fans anticipating the film Avengers: Doomsday should find playful overlaps in the update.
The publisher described the expansion as an opportunity for players to enjoy fresh content tied to the Doom storyline, without providing further character confirmations beyond the two promised playable additions.
Release window, platforms, and how to follow updates
The expansion is slated for fall 2026.
Tribute Games revealed the DLC on August 17, 2026 via its official Twitter account and Dotemu issued the supporting press release.
Players who track releases on console and handheld platforms often look for official announcements through outlets such as Nintendo Direct and storefront listings like the eShop, and will likely see platform-specific details and pricing posted closer to the launch date.
Sources: Tribute Games social announcement (August 17, 2026) and Dotemu press release.
Tribute Games and publisher Dotemu have announced a paid expansion for Marvel Cosmic Invasion titled The Siege of Castle Doom.
The brawler, which launched in December 2025, has received multiple content drops since release; this new expansion was revealed via Tribute Games social channels on August 17, 2026 and is scheduled to arrive in fall 2026.
Background and developer context
Marvel Cosmic Invasion is a contemporary beat em up that blends mechanics and character archetypes from decades of Marvel brawlers.
The project is developed by Tribute Games with publishing and promotional support from Dotemu.
Both companies are recognized for work in retro-inspired 2D action and brawler design, and Cosmic Invasion continued that focus when it launched in December 2025 and followed up with several DLC releases.
What The Siege of Castle Doom includes
According to the announcement, The Siege of Castle Doom will center on Doctor Doom and introduce a new game mode plus two additional playable characters.
Tribute Games used social media to frame the expansion as a Castle Doom-focused confrontation with Doom at its center; in journalistic terms, the studio said the update will position players to confront Doctor Doom inside a fortified new area that expands the game's combat scenarios.
Dotemu issued a press release accompanying the announcement and noted that fans anticipating the film Avengers: Doomsday should find playful overlaps in the update.
The publisher described the expansion as an opportunity for players to enjoy fresh content tied to the Doom storyline, without providing further character confirmations beyond the two promised playable additions.
Release window, platforms, and how to follow updates
The expansion is slated for fall 2026.
Tribute Games revealed the DLC on August 17, 2026 via its official Twitter account and Dotemu issued the supporting press release.
Players who track releases on console and handheld platforms often look for official announcements through outlets such as Nintendo Direct and storefront listings like the eShop, and will likely see platform-specific details and pricing posted closer to the launch date.
Sources: Tribute Games social announcement (August 17, 2026) and Dotemu press release.
