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Sub-Mariner #21 cover
Cover: Marie Severin & Johnny Craig

Sub-Mariner #21

Jan 1970 · Marvel · 0.15 USD
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“Invasion from the Ocean Floor!”

"Invasion from the Ocean Floor!" sees Namor caught in a deadly crossfire as Lady Dorma orchestrates an Atlantean assault on New York City to free him from a city-wide dragnet. With the Sub-Mariner pleading for peace, Lord Seth unleashes three colossal turtle monsters using the fabled Proteus Horn, forcing Namor to battle both the beasts and the escalating conflict. Written by Roy Thomas and brought to life with dynamic art by Marie Severin and Johnny Craig, this 1970 Marvel classic features a cover by Severin and Craig, capturing the scale and urgency of the underwater war.

writer Roy Thomas · artist, colorist Marie Severin · inker Johnny Craig · letterer Artie Simek · cover Marie Severin, Johnny Craig

ComicBooks.com Value

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Raw (Fine) $12
CGC 9.8 · 8 in census $835
CGC 9.6 · 22 in census $258
CGC 9.4 · 21 in census $169
CGC 9.2 · 20 in census $94
CGC 9.0 · 7 in census $93*
CGC 8.5 · 13 in census $69
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CGC 8.0 · 5 in census $69*
CGC 7.5 · 1 in census $61*
CGC 7.0 · 4 in census $47
CGC 6.5 · 1 in census $47*
CGC 6.0 · 4 in census $43
CGC 5.5 · 1 in census $32
CGC 5.0 · 2 in census $32*
CGC 4.5 · 1 in census $31*
* estimate — limited direct-sales data at this grade
Our model’s value — refined as new sales data arrives · CGC census counts shown where available

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Full credits

writer Roy Thomas
artist, colorist Marie Severin
inker Johnny Craig
letterer Artie Simek
cover pencils Marie Severin
cover inks Johnny Craig

Reprints

Reprinted in El Príncipe de la Atlántida #29 (1971), I Fantastici Quattro #82 (1974), Eclipso #56 (1975), Submariner #3 (1977), Spider-Man Comic #332 (1979), Spider-Man Comic #333 (1979), Marvel Masterworks: The Sub-Mariner #4 (2011), Namor, the Sub-Mariner Epic Collection #3 (2022)

Key issues in Sub-Mariner

#5★
#5 1st appearance — Todd Arliss
#23★
#23 1st appearance — Orka
#32★
#32 1st appearance — Llyra
#50★
#50 1st appearance — Namorita
#58★
#58 1st appearance — Tamara Rahn
#62★
#62 1st appearance — Queen Zartra
#66★
#66 1st appearance — Force
#68★
#68 1st appearance — Henry Croft

Variants (1)

foreign
British

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