This issue has variants.
Cover code: 90129-501. This issue includes the 3rd annual Kenner 16-page Fun Catalog.
Captain Hook appears with two hands.
Writer, Mark Evanier, says it wasn't noticed until 6 months after it was printed (from his "The Official Mark Evanier Gold Key Checklist"); in Evanier's notes, the story is entitled Electronic Brain Sprain.