Sadly, the ghostly figure doesn't turn out to be a dimensionally-shifted Terra-Man...
Superman & the horseman by Curt Swan & Bob Oksner. The rest of the cover, according to GCD, is "Mostly photo cover, with photos of Bob Rozakis, Cary Bates, Jack C.
Harris, Carl Gafford, and E. Nelson Bridwell. Julius Schwartz's records
credit this cover to Jack Adler & Staff, indicating the cover was
pasted up from other sources."