It’s a little more complicated than “an episode”. For instance, the most popular cable program “Yellowstone” is on the Paramount Network. New episodes are shown there for a few days, but prior episodes are on NBC’s Peacock network. Many other popular shows are that way—new episodes on one platform (Chicago Med on Hulu), prior episodes on another platform (earlier eps in Netflix).

The Star Trek franchise is a grab bag between Amazon Prime, Netflix, Hulu and Paramount+.