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When I was a kid, I was obsessed with this one Justice League movie. I think it might've been on a cassette, that's how old this is. It was animated, and shed a little insight as to how Wonder Woman came to be part of the team. The main antagonists were aliens who kidnapped people and kept them in these weird red bubble-type things. Lately, I have become obsessed with finding this movie, but do not know what it was called.