Activision's Dan Amrich posted on his blog
earlier this week that the "Character & Sim Mission" DLC pack for Marvel: Ultimate Alliance 2
will be delisted from the Marketplace and taken offline on December 31st, 2010.
This same DLC pack, which features 5 playable characters (Carnage, Magneto, Psylocke, Cable, and Black Panther) and 4 new simulations as well as 8 achievements worth 250gs, was pulled in the past before returning after a several month hiatus from the Marketplace. However, as reported in this article
, the content was always intended to only be available for a limited period.
For those of you concerned about potential compatibility issues between players who do and do not have the DLC when playing multiplayer, Amrich notes that you can download the free Character and Sim Mission Pack Teaser
to ensure that you encounter no difficulties related to not having content which will soon no longer be available.
If you want to make sure you don't miss the opportunity to complete the game, you can download the pack here