Lego super heros have been a dream of mine sense I was a kid, and with the Lego acquisition of the Marvel and DC license, I could not be more thrilled with the recent Spiderman, Batman, and Avengers sets. These sets have turned out great and fit with the Lego brand 100%.
The X men set with Wolverine turned out great and was a blast to play with, but my one complaint with the Marvel sets so far is that there is only one set with a build-able backdrop, the Helicarrier. I feel like this set could be the Marvel equivalent of the batcave set from the DC Super Heroes line.
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I would include the big names in the set including Xavier, Jean Grey (possibly as Phoenix) Wolverine, Cyclops, Magnito (as a holigram or real person) Nightcrawler, and Rogue. Storm or Gambit could also be good inclusions, or could be expanded upon in a vehicle hanger set. The appearance would match that of Wolverine, based on the comics and the 1992 cartoon show.