The Yellow Mask

Trivia

• 🗓️ The Yellow Mask first appeared in Superman #7 in 1940 — that's 86 years ago. It's a recognized key issue.
• 🎨 Co-created by G. B. Armbruster.
• 📚 Appears in 4 issues across 4 different series.
• ⭐ 1 of their appearances are key issues collectors actively chase.