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Color; Standard Comic Issue; 48 pages
There are other versions of this issue in the database:
Superman (1987) #50 2nd Printing
Superman (1987) #50 UPC Code
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Krisis of the Krimson Kryptonite
DC Comics Graphic Novel Collection [GER] (2015) #81
Superman (1984) #85
Superman (1990) #26
Superman: Krisis of the Krimson Kryptonite (1996) TPB
Story implies that Mr. Impossible and Mr. Mxyzptlk are the same character (or fill in for each other from time to time).
Starman, Barrage and Dr. Hamilton appear in flashback.
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Alice 'Allie' (DC) (01)
Catherine 'Cat' Grant
Guardian (DC)(02 - Jim Harper Clone 1 [current])
Human Torch (Marvel)(02 - Johnny Storm)
Impossible Man (Marvel)
Invisible Woman (Marvel)
Jimmy Olsen (DC)(New Earth)
Lois Joanne Lane (DC)(Post Crisis)
Samuel 'Sam' Lane (DC)(Post Crisis)
Elinore 'Ella' Lane (post-Crisis)
Lucy Lane (post-Crisis)
Steve Lombard (Post-Crisis)
Alexander Joseph 'Lex' Luthor (DC)(Post Crisis)
Mr. Fantastic (Marvel)(01 - Reed Richards)
Mr. Mxyzptlk (03 - post-Crisis)
Sarah Olsen (Post-Crisis)
Starman (DC)(05 - Will Payton)
Superman (DC)(Post Crisis)(01 - Clark Kent)
Thing (Marvel)(01 - Ben Grimm)
Perry White (DC)(Post Crisis)
Alice White (DC)(Post-Crisis)
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Daily Planet (DC)(Post Crisis)
Fantastic Four (Marvel)
Project Cadmus (DC)
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