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Captain America #21 cover
Cover: Andy Kubert & Jesse Delperdang

Captain America #21

Sep 1999 · Marvel · 1.99 USD; 2.99 CAD
📊 ~49,045 copies sold its debut month
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In "Soundquake," Captain America faces a crisis born from his own weapon: a fractured shield has unleashed a dangerous vibranium corruption spreading across the planet. With the threat growing, Klaw—last seen imprisoned in a vibranium cell—breaks free, setting the stage for a high-stakes confrontation. Written by Mark Waid and brought to life by Andy Kubert’s dynamic art, with inks by Jesse Delperdang, colors by Gregory Wright, and letters by Todd Klein, this 1999 issue delivers a tense, grounded thriller. The cover by Andy Kubert and Jesse Delperdang captures the urgency of the moment.

Contains 3 stories
Soundquake
16 pp · Superhero
Captain America [Steve Rogers]The Avengers [Giant Man [Hank Pym]WaspTony Stark [Iron Man]]Edwin JarvisSharon CarterConnie FerrariKlaw (villain)Marvel Staffers (cameos)DC Staffers (cameos)Kurt Busiek (cameo)George Perez (cameo)Peter David (cameo)

In "Soundquake," Captain America faces a terrifying new threat when his damaged shield begins spreading a dangerous vibranium corruption, putting the entire planet’s vibranium at risk. With Klaw—last seen imprisoned in a vibranium cell—now free and on the move, Steve Rogers must confront both the unraveling of his iconic symbol and a villain whose powers are perfectly tuned to exploit the crisis.

Sgt. Fury in Bloodline Part 2
6 pp · War
Nick FuryHowling Commandos [Dum Dum DuganRebelGabe Jones]Baron Blood (villain)
Bullpen Bits
0.25 pp · Humor, Superhero

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Cast · 7 characters

Full credits

writer Mark Waid
letterer Todd Klein
cover pencils Andy Kubert
cover inks Jesse Delperdang

Reprints

Reprinted in Fantastic Four #18 (2000), Fantastic Four #19 (2000), Marvel Méga #15 (2000), Captain America: Land of the Free #[nn] (2013), Captain America by Mark Waid, Ron Garney & Andy Kubert Omnibus #[nn] (2017), Captain America: Heroes Return - The Complete Collection #2 (2022)

Key issues in Captain America

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