First Appearance: Cosmo the Merry Martian #1 (Sep. 1958): "[Soap Bubbles]"
Number of Appearances: 6
Squarehead is an alien whose body is shaped like a cube. He clearly does not belong to the same Martian species as Cosmo the Merry Martian, but he appears to live on the same planet. In four of the six one-page Squarehead strips published in Cosmo the Merry Martian comics, Squarehead interacts with characters who look like they are Martians of the same species as Cosmo.
Suggested links for further research about this character and the character's religious affiliation: