First appeared in Captain America #217 in 1977 as Marvel Boy and was created by Don Glut, Roy Thomas, and John Buscema. Wendell Vaughn was a former U.S. Army lieutenant and S.H.I.E.L.D. agent who acquired the Quantum Bands and became Quasar.
Various Marvel, DC, Image, Valiant, Dark Horse, Dynamite, etc. characters you want to see make live-action appearances, or if they have already appeared in one universe, want to see them in another universe.
