If you want to know more about history of one of the most popular thrash metal bands and also a member of “The Big 4”, but you’re too lazy to read, maybe we have something for you.
A YouTuber named Ale Yanok made an excellent video called “The Evolution of Megadeth (1982 to present)” has all the basic info you need. It may not be as detailed as a documentary or wikipedia page, but it’s visually satisfying and incredibly memorable.
You should also check out the rest of his videos if you’re into classic heavy metal, because he sure does have the content you’re looking for.