The Siege of Castle Doom Begins - Our Second DLC Is Live Now!
Tribute Games Inc.
The Siege of Castle Doom DLC is available now on, with a base price of $7.99 | 7.99€ with a 10% discount until November 17th!
If you haven’t joined the fight with MARVEL Cosmic Invasion already, we’re also pulling together a Year of Doom bundle featuring the base game, and the two DLCs bringing an additional 10% off!
The Siege of Castle Doom brings two new Super Heroes into the fray, with Susan Storm wielding fantastic light-bending powers as The Invisible Woman while Doctor Doom brings his own blend of technology and occult abilities.
In addition to our two new Super Heroes, The Siege of Castle Doom also brings our all-new Castle Doom game mode. This run-based mode pits you against time in a journey through Castle Doom’s labyrinthine corridors. Defeat enemies, collect batteries, charge the stabilizer and stop Doctor Doom from using his deadly Cosmic Inductor.
We also wanted to send a huge thank you to all of the heroes who have joined us on our journey. We’ve now seen over two million players join the fight in MARVEL Cosmic Invasion and DLC like this simply would not be possible without your support. Thank you, for helping us to push Annihilus back into the Negative Zone!
So let’s get to it! Take on the new challenge or dive back into the main campaign with new Super Heroes with The Siege of Castle Doom, available now!
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This announcement was originally published by Tribute Games Inc. on Steam on Nov 10, 2026.
Open the original on Steam