The 80s are in full force in Superman 421 (July 1986), in a tale by Bates, Swan and Hunt that reflects the newcomer to the airwaves, MTV.
Lois Lane, Lana Lang, Perry White and Jimmy Olsen all discover that their normal television shows have vanished, replaced by Superman, now a captive in a weird world, seemingly under the spell of Mr. Mxyzptlk.
Superman is being tormented by rock versions of his friends, but oddly, so is Mxyzptlk, who winds up on a leash held by that world’s version of Lana Lang.
The real villain of the story turns out to be Mr. Mxyzptlk’s older cousin, who looks much the same. He hates Mxyzptlk, so is out to both torment him, and out-torment him when it comes to Superman. But Mxyzptlk worries about both of their lives, as his cousin is a much nastier imp.
When Superman goes up against a rock version of Clark Kent, he gets the idea to replace him, and get close enough to the real villain to take him down.
It works, and Mr Mxyzptlk is not only grateful, he even expresses that he has seen how awful it is to be tormented this way, and more or less promises to stop pestering Superman.
But it’s not much of a promise, as he is back in two months in the final issue of DC Comics Presents.