Challengers of the Unknown » 7 issues
Volume » Published by DC Comics. Started in 1998.
Volume 1
Kra appears in 7 issues in this volume.
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Issue #8
Prisoners of Robot Planet!
July 1959
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Issue #42
"The League of Challenger Haters"
March 1965
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Issue #45
The Queen of the Challenger-Haters!
September 1965
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Issue #48
Twilight of the Challengers!
March 1966
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Issue #55
"Taps for Red"
May 1967
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Issue #60
The Thing That Could Not Die/2 Hours to Die!
March 1968
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Issue #61
"The Robot Hounds of Chang"
May 1968
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