|Volto asking for a cereal as reward for risking his life|
Volto is a martian that came to Earth for some reason that the writer decided not to share with the audience. He decided to become a superhero. Again, the reason with withheld. Volto befriends a small boy Jimmy, who does nothing to further the plot.
His adventures were told in one-page stories. Each story has a problem emerge. Volto then uses his powers while explaining them out loud. This is often some variation on "my left hand repels" and "my right hand attracts". Then, he eats Grape Nut Flake cereal usually with Volto or some other character praising it.
Volto activates his powers by yelling his name. When this happens, he can repel (via his left hand) or attract (right) an object. Despite this being called "magnetism", the power works on any object not just metal. However, using this power drains energy that can only be restored by eating cereal.
Martians Don't Eat Human Flesh
There is something odd I noticed. Both the Volto Archive and Public Domain Super Heroes claim the other martians eat human flesh. However, none of the comics I could find supported this claim. In fact, Volto directly state all martian eats cereal grains several times.
I also did some Google image searches to see about the human flesh thing.