As most people who have ever submitted a college essay would know, Plagiarism isn't typically looked on fondly. Usually, plagiarism can be seen in either writing or visual media... but what happens when some total stranger steals your superhero identity?
Jerry Steele was just your average WWII soldier-turned Patriotic Hero (seriously, there are so many America-themed heroes clad in the red white and blue, and a couple themed around the Confederate Flag because this is the 40s). As V-Man, he punched up the Nazis real good with the help of his super costume which increased his strength and mental capabilities. Also helping him was a group of youngsters called "The V-Boys" (which sounds slightly derogatory).
Move to 1944... a new person came into town, dressed in the same costume and calling himself "Captain V". You may think that this is just Jerry Steele trying out a new name... but no. Captain V was the secret identity of a Puppeteer named Alan Dale, who seemingly had no connection to V-Man, but had the same costume and power set - well, actually, he had one new power: the "V-beam".
Now, this case of plagiarism isn't one that'd result in any legal consequences irl, mainly because these were both characters by Fox Features Syndicate (the owner of other Golden Age superheroes like Dynamite Thor and the Blue Beetle)... but that only makes it more confusing. Why did they do this? Did they just forget what V-Man's name was or something? If you want a headcanon, you could say that Captain V was one of the V-Boys, but the timeline doesn't match up, it's only been 2 years!
Even more confusing is the third name change. For some fucking reason, Alan decided that Captain V just wasn't cutting it as a superhero name, so he changed it to The Puppeteer. Because that's what his day job is. Jesus Christ Alan, what's wrong with you? You dress up in stars and stripes, have a V-themed costume, and you decide to call yourself The Puppeteer!?! That'd be like if instead of "Superman", Clark Kent just decided he was going to fly around the city as "The Reporter"!