Superman and Jimmy Olsen art by Jack Kirby (partially found comic material; early 1970s)
Status: Partially Found
Jack Kirby was a comic book writer and artist who created many characters and teams which are now staples of the medium (most of which for Marvel Comics in the 1960s, like the Fantastic Four). Contract and attribution disputes between Kirby and Marvel led him to quit and begin working for rival DC Comics in the early 1970s. It was then that Kirby began work on his magnum opus: The Fourth World. The Fourth World was a massive, epic storyline that spanned 4 comic book titles Superman's Pal Jimmy Olsen, The Forever People of Super Town, New Gods, and Mister Miracle, as well as a climactic graphic novel The Hunger Dogs.
The Fourth World began with the publication of Superman's Pal Jimmy Olsen #133 in October 1970. Initially reluctant to draw a character like Superman that he did not create, Kirby made a new design for the character, using a new "S" emblem and other minor changes. DC executives were not happy with this and got noted Superman artists Al Plastino and Murphy Anderson to draw over Kirby's designs with more traditional looks for Superman and his titular pal Jimmy Olsen. As such, most of the original penciled panels that included those characters in Superman's Pal Jimmy Olsen and The Forever People of Super Town
Other people working for DC at the time, such as Mark Evanier and Marv Wolfman, did get to see Kirby's original pencils, and some pieces of his original art do still exist, including an unused cover sketch. The rest has not been seen anywhere since the initial redraws were done before publication.
Left - Jack Kirby,
Right - Murphy Anderson redraw
Left - Kirby,
Right - Anderson