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Action Comics #254

DC ⋅ 1959

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Action Comics #254
 
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$70
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$350
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1st appearance and origin of Bizarro #1, an imperfect version of Superman

Action Comics #255

DC ⋅ 1959

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Action Comics #255
 
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$60
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$180
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$600
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1st appearance of Bizarro Lois Lane

Action Comics #256

DC ⋅ 1959

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Action Comics #256
 
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$20
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$60
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$205
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Key Facts

1st appearance of Dick Wilson, later Dick Malverne, a love interest of Supergirl

Action Comics #257
Non-Key

DC ⋅ 1959

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Action Comics #257
 
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Action Comics #258
Non-Key

DC ⋅ 1959

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Action Comics #258
 
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Key Facts

2nd cover appearance of Supergirl

Action Comics #259
Non-Key

DC ⋅ 1959

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Action Comics #259
 
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Action Comics #260
Non-Key

DC ⋅ 1959

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Action Comics #260
 
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Action Comics #261

DC ⋅ 1960

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Action Comics #261
 
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$35
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$100
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$325
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Key Facts

1st appearance of Streaky the Supercat

Action Comics #262

DC ⋅ 1960

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Action Comics #262
 
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$15
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$50
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$160
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Key Facts

Introduction of the concept that Kryptonians derive their powers from Earth's yellow sun

Introduction of the concept that Kryptonians are as powerful as ordinary humans under their native planet's red sun

Action Comics #263

DC ⋅ 1960

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Action Comics #263
 
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$45
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$140
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$450
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Key Facts

Introduction of Bizarro World

Action Comics #264
Non-Key

DC ⋅ 1960

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Action Comics #264
 
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Action Comics #265
Non-Key

DC ⋅ 1960

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Action Comics #265
 
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Action Comics #266
Non-Key

DC ⋅ 1960

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Action Comics #266
 
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Action Comics #267

DC ⋅ 1960

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Action Comics #267
 
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$75
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$220
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$825
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Key Facts

3rd appearance of the Legion of Super-Heroes

First meeting of the Legion and Supergirl

1st appearance of Chameleon Boy

1st appearance of Invisible Kid

1st appearance of Colossal Boy

Action Comics #268
Non-Key

DC ⋅ 1960

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Action Comics #268
 
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Action Comics #269
Non-Key

DC ⋅ 1960

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Action Comics #269
 
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Action Comics #270
Non-Key

DC ⋅ 1960

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Action Comics #270
 
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Action Comics #271
Non-Key

DC ⋅ 1960

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Action Comics #271
 
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Action Comics #272
Non-Key

DC ⋅ 1960

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Action Comics #272
 
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Action Comics #273
Non-Key

DC ⋅ 1960

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Action Comics #273
 
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Action Comics #274
Non-Key

DC ⋅ 1961

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Action Comics #274
 
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Action Comics #275

DC ⋅ 1961

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Action Comics #275
 
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$12
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$40
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$130
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Key Facts

Debut of Red/Green Kryptonite

Causes mutations, an extra eye on the back of Superman's head in this issue

Action Comics #276

DC ⋅ 1961

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Action Comics #276
 
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$400
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Key Facts

1st appearance of Sun Boy, a solar-powered member of the Legion of Super-Heroes

1st appearance of Phantom Girl, a member of the Legion of Super-Heroes who has the ability to phase through objects

1st appearance of Triplicate Girl, a member of the Legion of Super-Heroes who can split into three identical bodies

1st appearance of Bouncing Boy, a density-changing member of the Legion of Super-Heroes

1st appearance of Shrinking Violet, a member of the Legion of Super-Heroes who can shrink to sub-atomic size

1st appearance of Braniac 5, a genius and time-traveling member of the Legion of Super-Heroes

Supergirl joins the Legion of Super-Heroes

Action Comics #277
Non-Key

DC ⋅ 1961

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Action Comics #277
 
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Action Comics #278
Non-Key

DC ⋅ 1961

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Action Comics #278
 
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Action Comics #279
Non-Key

DC ⋅ 1961

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Action Comics #279
 
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Action Comics #280
Non-Key

DC ⋅ 1961

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Action Comics #280
 
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Action Comics #281
Non-Key

DC ⋅ 1961

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Action Comics #281
 
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Action Comics #282
Non-Key

DC ⋅ 1961

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Action Comics #282
 
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Action Comics #283
Non-Key

DC ⋅ 1961

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Action Comics #283
 
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Action Comics #284
Non-Key

DC ⋅ 1961

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Action Comics #284
 
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Action Comics #285

DC ⋅ 1962

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Action Comics #285
 
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$20
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$65
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Key Facts

Supergirl is introduced to the world

Classic cover art by Curt Swan

Action Comics #285
Non-Key

International ⋅ DC ⋅ 1966

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Action Comics #285
 
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Action Comics #286
Non-Key

DC ⋅ 1962

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Action Comics #286
 
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Action Comics #287
Non-Key

DC ⋅ 1962

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Action Comics #287
 
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Action Comics #288
Non-Key

DC ⋅ 1962

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Action Comics #288
 
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Action Comics #289

DC ⋅ 1962

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Action Comics #289
 
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$15
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$45
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$145
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Key Facts

1st appearance of Luma Lunai, an alien woman whose powers would not function under the yellow sun of Earth

In the story where Supergirl attempts to find a wife for Superman, he discloses to here that he would marry her if Earth's laws allowed cousins to be wed - tap cover and swipe to view panel

Action Comics #290
Non-Key

DC ⋅ 1962

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Action Comics #290
 
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Action Comics #291

DC ⋅ 1962

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Action Comics #291
 
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$15
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$50
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$150
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Key Facts

First meeting of Supergirl and Mr. Mxyzptlk

Action Comics #292
Non-Key

DC ⋅ 1962

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Action Comics #292
 
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Action Comics #293

DC ⋅ 1962

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Action Comics #293
 
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$10
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$35
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$175
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Origin of Comet the Superhorse

Action Comics #294
Non-Key

DC ⋅ 1962

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Action Comics #294
 
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Action Comics #295
Non-Key

DC ⋅ 1962

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Action Comics #295
 
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Action Comics #296
Non-Key

DC ⋅ 1962

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Action Comics #296
 
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Action Comics #297
Non-Key

DC ⋅ 1962

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Action Comics #297
 
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Action Comics #298
Non-Key

DC ⋅ 1963

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Action Comics #298
 
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Action Comics #299
Non-Key

DC ⋅ 1963

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Action Comics #299
 
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Action Comics #300

DC ⋅ 1963

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Action Comics #300
 
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$10
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$30
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$170
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Milestone issue Action Comics issue #300

Action Comics #301
Non-Key

DC ⋅ 1963

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Action Comics #301
 
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Action Comics #302
Non-Key

DC ⋅ 1963

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Action Comics #302
 
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