The modern age comic "Adventure Time 2013 Spooktacular" issue 1
Front cover art for the modern age comic "Adventure Time: 2013 Spooktacular" issue 1
Back cover art for the modern age comic "Adventure Time: 2013 Spooktacular" issue 1

Adventure Time 2013 Spooktacular #1 (October 2013, Kaboom)

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First appearance of Steven Universe in comics.