..


[Linked Image from milehighcomics.com] [Linked Image from milehighcomics.com]

Byrne drawing Superman ("Gladiator", Superman by another name) with the FF, on the cover of FF 249, Dec 1982....
https://readcomiconline.li/Comic/Fantastic-Four-1961/Issue-249?id=26948

....and re-visited, on the cover of SUPERMAN 8, July 1987 (cleverly replacing the FF on the DC side with Legion characters having the same powers) .
https://readcomiconline.li/Comic/Superman-1987/Issue-8?id=16742