WHAT? Impossible -- You're SACRIFICING yourself for another ROBOT? But ... That isn't LOGICAL! 
Metal Men #56 is an issue of the series Metal Men (Volume 1) with a cover date of March, 1978.
Synopsis for "The Inheritor Kills"
The Inheritor tries to kill the Metal Men, fails, and is himself killed. The United Nations General Assembly unanimously votes to delare the Metal Men to be Citizens of the World.
Appearing in "The Inheritor Kills"
Featured Characters:
Supporting Characters:
- Will Magnus
- Joanna
Guest Star:
Antagonists:
- The Inheritor (Dies)
- General Caspar
Other Characters:
- Metal Men's Landlady
Locations:
- Montauk Point
- Metal Men's Apartment on East Side of Manhattan
Vehicles:
- Metal Men's Flying Saucer (damaged)
Notes
- Final issue.