Captain/Appendices/Background information

The lead characters in Star Trek productions have traditionally been Starfleet captains. In the broadcast television era, these characters were (in production order) James T. Kirk (William Shatner), Jean-Luc Picard (Patrick Stewart), Benjamin Sisko (Avery Brooks), Kathryn Janeway (Kate Mulgrew), and Jonathan Archer (Scott Bakula; the only difference when listed chronologically being that Captain Archer was before the other four captains). This format was the intention from the very first episode of Star Trek, , wherein Captain Christopher Pike is established as the lead character. At first, the only exception to the captain-as-series-lead practice was when Sisko was portrayed as a commander during the first three seasons of , however in the streaming era, this has become much more common: for example, in , Captains Philippa Georgiou, Gabriel Lorca, Christopher Pike, and later Saru serve as secondary characters to series lead Michael Burnham, who only becomes a captain herself at the end of the third season after a long story arc. Similarly, follows retired Admiral Jean-Luc Picard, while follows a group of ensigns.
Regarding the challenge of following the legacy of so many extremely well-established series lead characters who had been Starfleet captains, Discovery Executive Producer Alex Kurtzman commented, "It's incredibly difficult to follow the amazing Starfleet captains that have already been created and beloved by so many. Every single one of them in different ways have been rendered so beautifully and so specifically that they're all tough acts to follow, but I'm sure that, when each one was being conceived, that the creators of those particular captains were scared about, you know, matching the one that had come before." ("Discovering Discovery: The Concepts and Casting of Star Trek: Discovery", DIS Season 1 DVD and Blu-ray special features)
The actors who have appeared in lead roles as Star Trek captains on broadcast television have been extremely varied. Jonathan Frakes remarked, "The five captains are so distinctive because of the five actors that play them, obviously. Patrick [Stewart] was cast against type, coming after Bill [Shatner]. Avery [Brooks], quite obviously, was cast against type, coming after Patrick. It was smart to bring Kate [Mulgrew] in, as a woman, and then Scott [Bakula] had an entire charm of his own. I think [...] whether it was planned or not, it was a very successful endeavor." (The Captains)
The Bajoran Militia, which also used army rank names, has been referred to by the as having a captain grade, with an insignia seen in episodes on officers subordinate to Major Kira Nerys, although they were never referred to by that rank on screen.