Comic Title: World's Finest Comics #156
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: March 1966
On Sale Date: January 25, 1966 Newsstand Date January 25, 1966
Source: House Ad, Batman #179, Page 15

Copyright Date January 25, 1966
Source: Library of Congress, Periodicals 1966

Frequency: Monthly, with the exception of Jan., April and July
Cover Price: $0.12
Page Count: 32
Editor: Mort Weisinger

Title: "The Federation of Bizarro Idiots"
Pages: 18

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

Writer: Edmond Hamilton
Penciller: Curt Swan
Inker: George Klein

Reprinted In:
Showcase Presents:World's Finest Vol. 3 TPB (2010)
Batman & Superman in World's Finest Comics:The Silver Age Omnibus Vol. 2 HC (2019)

Feature Character(s)

• Superman (last appearance in Justice League of America #43; next appearance in Action Comics #336)
• Batman (last appearance in Justice League of America #43; next appearance in Detective Comics #349)

Supporting Character(s)

• Robin (last appearance in Teen Titans #2; next appearance in Detective Comics #349)
• Jimmy Olsen (last appearance in World's Finest Comics #155; next appearance in Adventure Comics #342)
• Vicki Vale (last appearance in Detective Comics #320; next appearance in Batman Family #11)

Villain(s)

• Bizarro (last appearance in Superman #174; next appearance in Superman's Girl Friend, Lois Lane #74)
• Bizarro-Batman (next appearance in Superman's Girl Friend, Lois Lane #74)
• Joker (last appearance in Detective Comics #341; next appearance in World's Finest Comics #159)

Other Character(s)

• Citizens of Bizarro World (no further appearances)

Comments:
Part 2: "I Was an Idiot for the F.B.I."

Superman, Batman, Robin, and the Joker appear in a flashback to an untold case.

Synopsis:
While Superman and Batman are in space on a secret mission, Bizarro creates a Bizarro-Batman and travels to Earth. Jimmy Olsen and Robin have their hands full trying to prevent the Daffy Duo from demolishing Metropolis and Gotham until the heroes return.

Superman and Batman return to Earth, but they are unable to convince the Bizarros to leave. Next, the Bizarros break the Joker out of prison and assist him in robbing the guests at a charity ball. The Bizarros then reward the Joker for his misdeeds by returning him to prison.

Superman and Batman finally conceive a plan to rid the Earth of the Bizarros. They fly to Bizarro World and begin repairing the imperfect buildings and streets. When Bizarro and Bizarro-Batman learn of this, the return to Bizarro World to restore disorder. Before leaving Earth, the Bizarros leave behind the secret identities of Superman and Batman. Fortunately they hid the information buried deep inside the planet.