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Collects 21 issues

• Showcase #61957-01-00
• Showcase #71957-03-00
• Showcase #111957-11-00
• Showcase #121958-01-00
• Challengers of the Unknown #11958-04-00
• Challengers of the Unknown #21958-06-00
• Challengers of the Unknown #31958-08-00
• Challengers of the Unknown #41958-10-00
• Challengers of the Unknown #51958-12-00
• Challengers of the Unknown #61959-02-00
• Challengers of the Unknown