Mark Evanier is a historian who answers commonly asked questions about the comic book industry on his blog. Here are two of them:
1. There are two Captain Marvels. One is played by Brie Larson in the Marvel movie. The other is the main character in the DC movie Shazam. Evanier explains how that happened.
2. Popeye has two identical antagonists, Bluto and Brutus. Evanier also knows how that happened.
