Doctor Spectrum
Some say Doctor Spectrum was never real, that the whole story is a misprint and the file a prank. The ones who were there never laughed, and they never told the tale twice.
All data from the awesome folks at Marvel.
Doctor Spectrum Appears In
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Avengers (1963) #86
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Doctor Spectrum (2004) #1
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Doctor Spectrum (2004) #2
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Doctor Spectrum (2004) #3
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Doctor Spectrum (2004) #4
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Doctor Spectrum (2004) #5
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Doctor Spectrum (2004) #6
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Squadron Supreme (2006) #1
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Squadron Supreme (2006) #2
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Squadron Supreme Vol. 1: The Pre-War Years Premiere (Hardcover)
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Supreme Power (2010) #1
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Supreme Power (2010) #2
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Supreme Power (2010) #4
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Supreme Power (2011) #1