Dr. Regulus appears in 31 issues.
Legion of Super-Heroes
The Legion of Super-Heroes Archives
Crisis on Infinite Earths
Final Crisis: Legion of Three Worlds
Superboy and the Legion of Super-Heroes
DC Special Blue Ribbon Digest
Secrets of the Legion of Super-Heroes
Who's Who: The Definitive Directory of the DC Universe
Who's Who in the DC Universe
Tales of the Legion of Super-Heroes
Who's Who in the Legion of Super-Heroes
Legion of Super-Heroes: The Great Darkness Saga - The Deluxe Edition
Final Crisis: Legion of 3 Worlds
The Encyclopedia of Super Villains
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