Mystico may look supremely dull but his back story was wild. I couldn't say it any better than the Public Domain Super Heroes Wiki so here's what they had to say: Mystico was a mummy stolen from his museum by Dr. Slade, a mad scientist who resurrects him with a life-restoring "vita-ray." However, the vita-rays were turned up too high, and the machine explodes. The explosion not only destroys Slade's lab, but it also kills Dr. Slade. However, Mystico is revived and decides to become a crime fighter. His super powers were magic-based and did whatever the plot required. Here he fights some creepy creatures!