House of Mystery #169
In "The Terrible Toymaster," young Suzy stumbles upon Robby's hidden H-Dial and, in a twist of fate, is transformed into the powerful Gem Girl—though her newfound abilities come with a price. Written by Otto Binder and brought to life with dynamic art by Jim Mooney (who also handled the cover pencils and inks), this 1967 installment of House of Mystery blends childhood wonder with superhero thrills in a story where courage and memory collide.
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Suzy discovers Robby's secret and wants to use the H-Dial herself. She is transformed into Gem Girl and helps Robby defeat the Toymaster, but amnesia causes her to forget the experience later.
Plot details indexed by the Grand Comics Database (CC BY-SA).