Studios and networks are not only drawn to the proven storytelling a podcast provides, but they also like the built-in fan base — one that’s easier to reach and engage than, say, people who have bought a book. Tens of millions of listeners have downloaded StartUp, and “now Gimlet can go back to those people and tell them about ‘Alex, Inc.,” Mr. Davis said. “It’s great synergy.”

Podcasts are the new comic books.

Don’t worry though, comic books are still comic books too though.