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When Cassandra Nova took over Charles Xavier's body, the Imperial Guard was sent tricked into believing they had to kill all mutants. Cosmo was a part of the group of Imperial Guardsmen who went to the Xavier Institute and fought them. Once there, however, he was defeated by Cassandra Nova.
- 5 Appearances of Cosmo (Earth-616)
- Media Cosmo (Earth-616) was Mentioned in
- 3 Images featuring Cosmo (Earth-616)
- Quotations by or about Cosmo (Earth-616)
- Character Gallery: Cosmo (Earth-616)
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