But down in those waters, I saw New York's hero community witnessing its first true call to arms. There were heroes I'd met, and some I never saw before or again. I know most of us felt tiny in comparison to the devastation around us...but we did what we could. ... This was our first true call to arms. So there was no way Namor could have won the day...regardless of the destruction he'd wrought. And the strangest part of all...was that this day of great tragedy would be the first step...to another new dawn.
The history of the Angel spans some 70 years of publications. Below is an abridged version of his history. For an his complete version see the Unabridged History of Thomas Halloway.
Origin
Thomas Halloway was the son of a prison warden; his mother died in childbirth. The warden raised Thomas in isolation, in the prison itself, and was instructed by various experts who had taught him "everything." Thomas was also taught by the prisoners, who passed on the secrets of the underworld. When Thomas discovered that one of the prisoners was about to be electrocuted he saved him. For this deed Thomas was dubbed an "angel" by the inmate.
When Thomas reached adulthood he decided to become a private detective, and also adopted the costumed identity of "The Angel" to fight crime. During an adventure in which he saved a 4,000 year old woman, he was given the magical Mystic Cape of Mercury.
Post-War
After the War, the Angel was one of a number of heroes who formed the Penance Council, the ruling body of the V-Battalion, dedicated to fighting the rise of dictatorships and other threats to the world.
However, after a bystander was killed during an adventure, the Angel hung up his cape, unwilling to risk more innocent lives in his fight against crime. Still wishing to combat lawlessness and seeking a way to atone for his mistake,
he eventually founded a group of trained assassins, the Scourges, who would ambush and murder costumed criminals. Eventually, these acts of vigilantism were stopped by Captain America. To escape USAgent, he faked his own death.
Thomas Halloway retired and lived on a sprawling estate in Los Angeles.
Possibly the first active Marvel Golden Age hero, the Angel was retconned decades later as actually being two brothers using the same secret ID. See Angel II for info on his brother.