Issue: #273
Last valuation update: 2026-10-20
Cover by Curt Swan and Stan Kaye."The World of Mr. Mxyzptlk!" written by Jerry Siegel, penciled and inked by Al Plastino. Reprinted in Superman #218."The Supergirl of Two Worlds" written by Otto Binder, penciled and inked by Jim Mooney. Reprinted in Supergirl Archives #2.
First appearances: Jimmy Olsen Robot, Emma Lazarus
Creators: Jerry Siegel, Curt Swan, Stan Kaye, Otto Binder, Jim Mooney, Al Plastino, Mort Weisinger
Characters: Superman, Mr. Mxyzptlk, Supergirl, Jimmy Olsen Robot, Marvel Man, Marvel Maid, Emma Lazarus