Scarlet runs into one of her teachers from school, Professor Fychfud, who now runs the Aquarium. He takes Scarlet on a tour. When they get to the piranha tank, Scarlet sees human remains, and then finds herself pushed into the tank. She gets free and accuses the Professor, who denies wrong-doing. Scarlet and Sandy come back that night to investigate, but by then the Professor is in the grips of the real villain.
Reprinted:
in Harvey Comic Hits (Harvey, 1951 series) #59 [retitled as "Blood of a Monster [Part 1]"]