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Otto Binder

DC Jun 1956

Superboy #49

Superboy #49
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Low
$90
Mid
$350
High
$975
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Prototype of Metallo, this version was a Kryptonian robot who appeared only once as an ally to Superboy
DC Apr 1958

Adventure Comics #247

Adventure Comics #247
View Series Variants (5)
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$1.3K
Mid
$3.8K
High
$19K
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1st team appearance and origin of the Legion of Super-Heroes: Cosmic Boy, Lightning Boy, Saturn Girl
1st appearance of Cosmic Boy
1st appearance of Lightning Boy, later becomes Lightning Lad
1st appearance of Saturn Girl

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