In his original run his name and his reason fighting crime, or how he got his amazing plane was unknown and never revealed, he just appeared out of nowhere and started battling crime, he had no superpowers though he was rather strong, but he did have an airplane that could travel underwater as well as in the air.
Created by Ben Thompson, who also did Ka-Zar for Timely / Atlas / Marvel, the Masked Marvel was among the first of the characters created in response to the huge popularity of Superman.
The Masked Marvel, even though he also had a short run newspaper comic strip as well did not last long.
Gone before 1942 he is one of the public domain characters revived by Malibu and changed to the point of really being a completely different character.
Masked Marvel could fly a plane, was in great physical shape, invulnerable and was supposedly "the greatest detective in the world" (but not the ones that have Batman or Sherlock Holmes).