Nobody ever likes news of a DLC delisting, so we'll make this brief.
The DLC for http://www.trueachievements.com/Marvel-Super-Hero-Squad....htm
is no more. Just take a visit to the game's page on Xbox.com
and see for yourself. Sadly, the only item listed is the core game, meaning all of the game's three achievement-granting DLC items, "Captain America Collection
", "The Thanos Throwdown
", and "Doom on the Loose
", are no longer available for purchase.
We do not have word as to exactly why the delisting occurred, but it was likely due to licensing issues in the wake of the collapse of THQ