The second of the two Marvel Cosmic Invasion DLC updates promised for 2026 finally has a name, and it’s built around one of Marvel’s most iconic villains. Dotemu and Tribute Games today released the first look at The Siege of Castle Doom, a premium DLC that puts Doctor Doom at the center of an all-new game mode and brings two new playable characters along with it. It launches in fall 2026 on PlayStation 4, PlayStation 5, XBOX Series X|S, Switch, Switch 2, and PC via Steam.
Details beyond that are being held back for now, as neither the two new characters nor the specifics of the Doom-centric mode have been revealed, and there’s no price attached yet either. This is the second half of the DLC plan the companies laid out in May, when the first update added Cyclops and The Thing as a $3.99 bundle the same day it was announced, bringing the playable roster to 17 and arriving alongside the news that more than 1.5 million players had joined the fight since launch.
For anyone who hasn’t jumped in, Marvel Cosmic Invasion is a tag-team co-op beat ’em up in which heroes from across the Marvel universe band together against Annihilus and his Annihilation Wave, swapping between duos mid-fight through the Cosmic Swap system. The game launched on December 1 as a day one Game Pass title and went on to become a Family Game of the Year finalist at the D.I.C.E. Awards earlier this year.
Doctor Doom is also about as obvious a pick as Marvel villains get right now, considering Robert Downey Jr.’s take on the character headlines Avengers: Doomsday when it hits theaters on December 18, so a fall DLC putting Doom front and center lines up nicely with the biggest Marvel moment of the year. We’ve been fans of Tribute Games since Teenage Mutant Ninja Turtles: Shredder’s Revenge, something we mentioned when recommending Marvel Cosmic Invasion back in March, so a Doctor Doom mode from this team sounds exciting. Dotemu says character reveals and further details are coming ahead of launch, and for anyone trying to guess at pricing, the first DLC ran $3.99, for whatever that benchmark is worth.
