Greer Grant had been the costumed heroine known as Cat for only a short while when agents of HYDRA set out to kidnap Dr. Tumolo, the scientist responsible for giver her superhuman powers (Giant-Size Creatures #1).
While protecting her mentor from HYDRA, Cat was shot in the back by a pistol that fired alpha radiation. The heroine was doomed to die unless she received help from a hidden society of Cat People. Combining science and magic, the Cat People cured Greer Grant by transforming her into Tigra.
Back on the tails of HYDRA, she encountered Jack Russell in his alter ego as Werewolf by Night. Regarding the fur-coated female as a kindred spirit, the Werewolf helped Tigra.
To stop the evil organization from learning the secrets of the Cat People, Dr. Tumolo exposed the agents of HYDRA to a modern dose of the Black Plague.
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