Published Oct 1961 by DC.
Cover pencils by Curt Swan, inks by Stan Kaye. The 20th Century Achilles!, script by Edmond Hamilton, pencils by Curt Swan, inks by George Klein; Superman stops a 20th century "Achilles" and discovers his secret. Mr. Mxyzptlk's Super-Mischief!, pencils by Curt Swan; Mr. Mxyzptlk changes his name to try to prevent Superman from sending him back to the 5th dimension. Superman Owes a Billion Dollars!, script by Robert Bernstein, pencils by Curt Swan; An IRS agent decides that Superman owes back taxes and must pay within 24 hours. 36 pgs. $0.10. Cover price $0.10.