Because of course he is
You knew Stan Lee was going to make an appearance in LEGO Marvel Super Heroes. But did you know he was going to be a complete badass? Stan Lee can Hulk out, swing around like Spider-Man, use a laser blast like Cyclops -- He has ALL the powers.
He's basically like Rogue, or I don't know, Amazo from the DC Universe if you want to cross comic streams.
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