Ending stories is hard – trust me. But figuring out the right place to start them can be just as hard. That’s true for all kinds of stories, but particularly fantasy or sci-fi stories where you have to build the whole world around the story you’re telling and the characters involved. By definition their world existed before their story did and will continue to do so once it’s over (barring apocalypse, of course).

Which explains the popularity of prequels. There’s so much backstory to dig through, most of it only hinted at, that there appears to be a rich environment to exploit. It must also seem like a fairly safe investment, since you’re dealing with, if not familiar and fan-favorite characters, at least events and histories in which the fans are already invested.

But there’s an inherent problem with prequels – they’re playing in a universe in which the future is already known to us. That can box writers in and sometimes make it difficult for the prequel to stand on its own as a piece of compelling drama, something we should care about for its own merits.

I thought a lot about this problem over the weekend as the wife and I (at her suggestion!) finally caught up with the Obi-Wan Kenobi series.

The six-episode series is set in the time between Rise of the Sith, with its culling of the Jedi, and the original Star Wars (aka A New Hope), a time during which, for all we knew, Obi-Wan was living off the grid on Tatooine keeping tabs on Luke Skywalker. Years pass, of course, so the idea that he didn’t get into anything worthy of telling a story about is pretty sad, but do the writers use that freedom to do something really interesting?

No, not really.

The inciting incident of the series is when Princess Leia is kidnapped on Alderaan (nice planet – too bad it goes boom) by, of all people, Flea. This is part of a plan to draw out Obi-Wan so some Jedi hunters can get him. Those Inquisitors are kind of interesting and could have been explored in some depth, but they have a boss and his name is Darth Vader. And so, the series largely revolves around maneuvering Vader and Obi-Wan into the same space.

As a result, we get two solid confrontations between them, the second of which would have felt like a pretty epic duel if it had any kind of stakes. It couldn’t, however, because of the prequel problem: both Vader and Obi-Wan survive to fight again in Star Wars, so neither can be killed or even seriously injured in ways that conflict with the “future.” Likewise, young Leia (who, as you might expect, is quite the scamp) is never in any real danger, as we know she survives unscathed. Indeed, the series punts her offscreen for the final episode mostly, as it rushes back to Tatooine for a confrontation between one of the Inquisitors and Luke’s family – which, again, we know will ultimately come to nothing.

It didn’t have to be that way. Using Leia’s kidnapping to lure Obi-Wan out of hiding was a solid idea. Imagine if she’d mostly stayed off screen (a MacGuffin, if you will) while he scrapped with and evaded Inquisitors and grew into his status as a hero. There’s actually a good character arc in the series, as Obi-Wan goes from trying to lay low and hide to being more engaged with the Rebellion. Isn’t that a cool enough story to tell? Do we need the Vader stuff? Do we need any suggestion that Leia or Luke will be harmed?

Star Wars knows how to do this. Rogue One is regarded by a lot of people as the best Star Wars movie since the original trilogy, even though we knew precisely how it was going to end. What made it work was that existing characters were largely absent and we got to know and care about a whole new cast so that when they made the necessary sacrifices to complete their mission it landed with some heft.

Ultimately, I think the prequel problem is a matter of characters rather than universes. After all, we read historical fiction all the time that involves real events. It’s not what happens to characters, it how it effects them, changes them, that matters. But when your prequel ties itself to characters who can’t change, that becomes a problem. I’ve dinged Star Trek – Strange New Worlds for tying itself too closely to characters steeped in Trek lore, rather than freely exploring people we know nothing about.

I’ve never really been interested in the idea of writing prequels. I had a prequel story, of a sort, for one of the characters in the Unari Empire trilogy that I almost wrote, but ultimately decided that all that was important about him was in one of the books already. Generally speaking, I’d rather go on and dive into a new world with new characters than revisit old ground.

But if you asked nicely . . .