While those series were presented in standard comic book formats, they suffered from a distinct logistical flaw: continuity changes quickly rendered the printed volumes obsolete. If a character died, changed costumes, or gained new powers, the existing handbook entry became inaccurate.

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Retro Review: The Ultimate Bedside Bible – OFFICIAL HANDBOOK OF THE MARVEL UNIVERSE MASTER EDITION #1 (1990)

A meticulous breakdown of strength classes, energy projection limits, and specialized weaponry.

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