First Appearance: Daring Mystery Comics #7 (April 1941).
Golden Age Appearances: Daring Mystery Comics #7 & 8.
Modern Appearances: Captain America #442.
Years Active: 1941-present.
The Thunderer was Jerry Carstairs, a radio operator who put on a costume with a microphone-and-speaker set-up and went out to fight crime.
In Captain America #442 Carstairs appeared as an old man at an aging superhero reunion.
Note: Jim Steranko, in volume 1 of his History of Comics, says that the Thunderer become the Black Avenger. Unfortunately for Mr. Steranko, there's nothing in All-Winners #6 to prove this, the character making no reference to having been the Thunderer or being identified as the Thunderer. My guess is that the Black Avenger story in All-Winners #6 was simply an Thunderer inventory story slightly redone, which is probably what happened with the Blue Blade and the Fourth Musketeer.