In The Loop actually went to Marvel Superhero Island to check if Black Panther was featured in any of the material used in the area, outside of merch, and he is actually seen in the park.
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My guess that comes out of it, if it is something legitimately in the talks of plausibility, The Walt Disney Company; Marvel Entertainment/Marvel Studios; NBCUniversal/Comcast; and Universal Creative would have to hash out a deal to ensure that they can use Black Panther at Walt Disney World, at a reasonable fee.