Unless the captain isn't the main character. You could have a show where the lead characters belong to the team that goes on missions and their commanding officer is a supporting character, as with Stargate SG-1.
Not to hijack this, but why hasn't an idea like that been explored for Star Trek
? It's not the traditional Trek
format, but it might make for an interesting series. I am, of course, speaking only about TV series and not books or e-novels, as I know that some of these focus on characters who aren't captains or have a commanding role.
Not quite the same thing, but wasn't the original concept of TNG for Picard to be the older, wiser captain who does the diplomacy thing and stays on the ship, while Riker was the action hero who goes on landing parties and gets in to scrapes?