Oh, that Doctor Doom. He's always getting into some trouble or other. Why, in December, he's going to make trouble for the Avengers and X-Men (and be played by a miscast Robert Downey Jr.) in Avengers: Doomsday. But that is then, and this is now. Right now, the highly anticipated "The Siege of Castle Doom" DLC has just been released for MARVEL Cosmic Invasion. Doctor Doom will surely be making lots of trouble in the DLC, which adds him and Sue Storm as playable characters, plus a new mode!
"The Siege of Castle Doom" DLC features:
Doctor Doom Playable Character: Equipped with high-powered tech armor of his own design, along with occult skills and his genius intellect, Doctor Doom is the biggest threat in the universe... and Annihilus definitely won't be up to the challenge.
Sue Storm Playable Character: Cosmic rays have given archeologist and explorer Susan Storm massive light-bending powers and force field manipulation. She now fights for the survival of the galaxy as The Invisible Woman, bringing in never-seen-before abilities to MARVEL Cosmic Invasion.'

Castle Doomstadt Mode:
Defeating Doom’s forces will charge up your Stabilizer, the latest creation from Reed Richards to help you stop his old nemesis’ newest plan. Gather Battery Cells to get defence, damage or tactical upgrades, choose between 12 different perks to enhance your defense, throw damage, buff your ammunition or healing faculties.
Castle Doomstadt’s corridors and ramparts will offer many challenges but lots of opportunities to organize your siege. Collect powerful equipment, take on grueling challenges and help your team deal the final blow against Doctor Doom.
Steam reviews are a bit mixed on the DLC at present, with complaints mainly focused on the roguelike Castle Wolfenstein, I mean Castle Doomstadt mode. I'd have tried it out already, but I've been under the weather this week. In general, I find TMNT: Shredder's Revenge to be a better game than MARVEL Cosmic Invasion. My experiences are colored by Cosmic Invasion's poor online play, which (as of a couple of months ago) still randomly drops players from games all these months after release. Well, it'll still be interesting to try the new mode and see if things are more stable with the arrival of the new DLC.
MARVEL Cosmic Invasion costs $29.99 on Xbox Series S|X, PlayStation 4 and 5, Switch, Switch 2, and Steam. "The Siege of Castle Doom" DLC costs $7.99, and has a ten percent launch discount through November 17.