Sidekick Milhouse?
Sidekick Milhouse was released for free during the Valentine's Day 2015 event during part three of the Fission Impossible Quest. He was re-released as a premium character during issue 4 of the Superhe...
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He was a limited time skin during the Valentines Mini-Event, which was a precursor to the Superhero Event. Maybe he'll come back during the Halloween event. You never know.
