kang is a pretty major character in the comics who's been around since the silver age. you don't have to be a "comic nerd" to know who he is. he's a lot bigger than, say, agatha harkness.
I mean I'm sure you all recognize the name but I'm not buying everyone here who is like "omg it got spoiled!!" had any real expectation of why Kang is a big deal other than "I know that guy!!"
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No problem! This is a cute and pop genocide of love!