Comic Title: Metal Men #21
Publisher: DC (National Periodical Publications, Inc.)
Address: 575 Lexington Avenue, New York, NY
Cover Date: Aug/Sep 1966
On Sale Date: June 21, 1966 Newsstand Date June 21, 1966
Source: House Ad, Superman #189, Page 29

Newsstand Date June 21, 1966
Source: Direct Currents, Justice League of America #46, Page 11

Copyright Date June 21, 1966
Source: Library of Congress, Periodicals 1966

Frequency: Bi-monthly
Cover Price: $0.12
Page Count: 32
Editor: Robert Kanigher

Title: "The Metal Men Vs the Plastic Perils"
Pages: 24

Feature(s):
Metal Men (of Earth-1)

Writer: Robert Kanigher
Penciller: Ross Andru
Inker: Michael Esposito

Reprinted In:
Showcase Presents Metal Men Vol. 2 TPB (2008)

Feature Character(s)

• Metal Men (last appearance in Brave and the Bold #66; next appearance in Metal Men #22)
• Platinum (last appearance in Brave and the Bold #66; next appearance in Metal Men #22)
• Gold (last appearance in Brave and the Bold #66; next appearance in Metal Men #22)
• Mercury (last appearance in Brave and the Bold #66; next appearance in Metal Men #22)
• Lead (last appearance in Brave and the Bold #66; next appearance in Metal Men #22)
• Iron (last appearance in Brave and the Bold #66; next appearance in Metal Men #22)
• Tin (last appearance in Brave and the Bold #66; next appearance in Metal Men #22)
• Nameless (last appearance in Metal Men #20; next appearance in Metal Men #22)

Supporting Character(s)

• Doctor Will Magnus (last appearance in Brave and the Bold #66; next appearance in Metal Men #22)

Villain(s)

• Professor Bravo and his Plastic Gang: Styrene, Silicone, Methacrylate, and Polyethylene (no further appearances)
• A gang of motorcycle marauders and a group of gangsters (no further appearances)
• Paula Von Gunta (last appearance in Wonder Woman #163; next appearance in Wonder Woman #168)
• Paula's gang (no further appearances)

Guest Appearance(s)

• Flash (last appearance in Justice League of America #47; next appearance in Brave and the Bold #67)
• Batman (last appearance in World's Finest Comics #159; next appearance in Brave and the Bold #67)
• Robin (last appearance in World's Finest Comics #159; next appearance in Detective Comics #354)
• Wonder Woman (last appearance in Justice League of America #45; next appearance in Aquaman #30)
• Steve Trevor (last appearance in Wonder Woman #158; next appearance in Wonder Woman #166)

Synopsis:
Tired of fighting robot menaces, the Metal Men seek out real criminals to battle. They travel to different cities around the country, but when the find crooks they are upstaged by other heroes including Flash, Batman, and Wonder Woman. Discouraged, the Metal Men return home.

A crook in a stolen armored car then approaches Metal Men headquarters. The robots try to stop the crook, Professor Bravo, but face off against Bravo's Plastic Gang instead. The team fails to stop the plastic men as a group and individually, so Gold and Tina research plastics in the library. Their research shows that plastic has a low boiling point, so they pour boiling liquid on the gang to destroy them. Once the Plastic Gang is defeated, the Metal Men apprehend Professor Bravo.