Cover: Curt Swan & Stan Kaye
Superboy #40
☆ Be the first to review + Add to your collection — Join freeContains 5 stories
The Boy of Clay!
Jonathan KentMartha KentLana LangProf. Lang
The School for Geniuses!
Untitled Humor story
The Magic Necklace!
Lana LangProf Lang
Untitled Humor story
ComicBooks.com Value
Our Model is In Beta
Raw (Good) $54
CGC 9.4 · 1 in census $1,493*
CGC 9.2 none in existence
CGC 9.0 none in existence
CGC 8.5 none in existence
CGC 8.0 · 2 in census $364*
CGC 7.5 · 3 in census $292*
Show all 14 grades ▾
CGC 7.0 none in existence
CGC 6.5 · 3 in census $204*
CGC 6.0 · 1 in census $176*
CGC 5.5 none in existence
CGC 5.0 none in existence
CGC 4.5 none in existence
CGC 4.0 · 2 in census $104*
CGC 3.5 · 2 in census $93*
* estimate — limited direct-sales data at this grade
Our model’s value — refined as new sales data arrives · CGC census counts shown where available
More listings for this title
VF $2.99 FN · Newsstand $5.98 Newsstand $5.99 VF $12.5 NM $24 NM $24 PR $26 FR $34
Related listings we couldn't confirm as this exact issue · 12 total · seen 22 days ago
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Full credits
Reprints
Reprinted in My Greatest Adventure #4 (1955), Century, The 100 Page Comic Monthly #4 (1956), Super Adventure Comic #78 (1956), Superboy Adventure Book #1957-58 (1957), DC Finest: Superboy: The Superdog from Krypton #[nn] (2025), Supermán #66
Key issues in Superboy
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