Comic Title: Superman #173
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: November 1964
On Sale Date: September 17, 1964 Copyright Date September 17, 1964
Source: Library of Congress, Periodicals 1964

Frequency: Monthly, with the exception of March, June, Sept. and Dec.
Cover Price: $0.12
Page Count: 32
Editor: Mort Weisinger

Notes:
This issue contains a half-page text feature entitled, "Luthor's Inventions".

Title: "The Triumph of Luthor and Brainiac"
Pages: 8

Feature(s):
Superman (of Earth-1)

Writer: Jerry Siegel
Artist: John Forte

Feature Character(s)

• Superman (last appearance in Superman #173; next appearance in Action Comics #318)

Guest Star(s)

• Batman (last appearance in Aquaman #18; next appearance in Detective Comics #333)

Supporting Character(s)

• Jimmy Olsen (last appearance in World's Finest Comics #145; next appearance in Superman's Pal, Jimmy Olsen #81)

Other Character(s)

• Residents of planet BH-Galaxy 489 (no further appearances)
• Rombo (a robot; no further appearances)

Cameo Appearance(s)

• Lex Luthor (as a statue)
• Brainiac (as a statue)
• Mr. Mxyzptlk (as a statue)
• Joker (as a statue)
• Clayface (as a statue)
• Justice League of America (in a photo)
• Flash (in a photo)
• Aquaman (in a photo)
• Green Arrow (in a photo)
• Wonder Woman (in a photo)
• Legion of Super-Heroes (in a photo and as statues)
• Bouncing Boy (in a photo and as a statue)
• Sun Boy (in a photo and as a statue)
• Cosmic Boy (in a photo and as a statue)
• Saturn Girl (in a photo and as a statue)
• Chameleon Boy (in a photo and as a statue)

Comments:
Superman and Batman wear Luthor and Brainiac disguises in this story. The real villains do not actually appear.

Synopsis:
An alien ship arrives on Earth requesting Superman's help. Since Superman is away, Jimmy Olsen boards the vessel and journeys to an alien planet. When he arrives he is taken prisoner by Brainiac and Luthor. The two villains compete for the honor of exposing Jimmy to the deadly "Fate Z."

While the villains duel, Jimmy escapes from his cell and rescues several other prisoners. When the villains return, he uses a machine to synthesize Kryptonite. Luthor seems affected by the Green K, until Jimmy transforms it into a harmless jewel. He then reveals how he discovered that Superman was masquerading as Luthor to teach Jimmy a lesson about taking risks. Brainiac is revealed as Batman in disguise.