| POW! BIFF! POPS! (1978)
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Publisher: The Junior Council Boston Symphony Orchestra
Publication Date: 1978
Country: United States
A DC and Marvel co-production that was made as a promotion for the opening of the Boston Pops in 1978, and features characters from both universes saving the orchestra from a madman who's kidnapped them.
It had a print run of 250, signed and numbered by artist Christopher Bing, and was only sold the one occasion. Any unsold copies were then destroyed. Less than a dozen copies are known to still exist.
Number of issues cataloged: 1