Loosely based on Kass Morgan's series of post-apocalyptic Young Adult novels, The 100 follows a group of post-nuclear war survivors as they discover they're not as alone as they thought.

It's currently in its fifth season, and is as popular as ever with fans – even if they don't agree with every single decision the show's made.

But is the fifth season popular enough to lead to a sixth season? We're glad you asked! We've strapped on our hazmat suits to head out to The 100's surface to investigate...

The 100 season 6 trailer: When will we see it?

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After a long, long wait for fans, season five's trailer landed around a month before The 100 returned to screens, so we can expect the same from season six. Whether it'll reveal as massive a twist as the six-year time jump between season four and five, we can't say.

But what we do know is that show boss Jason Rothenberg revealed that season five will contain the biggest twist the series has ever given us.

"When this season comes to an end, it sets up a whole new adventure in a way that surprised me. We do keep reinventing the show every year – every year is a new adventure, a new set of bad guys, a new set of goals for our heroes," he said,

"I think the twist at the end of this season is bigger than anything we've done in the past, let's put it that way. It could set us up for a long run."

You can watch the season 5 trailer above while you wait for the new one.

The 100 season 6 release date: When will it come out?

The CW

Here's the bad news, we have no idea when season six of The 100 will land... but we can have a good guess.

It'll almost certainly air in spring of next year, mainly because all of the previous seasons have landed in the first half of the year after premiering mid-season.

For season six, we're predicting spring, following season five's April premiere.

The 100 season 6 renewal: When was it renewed?

The CW

The 100's return was announced earlier this month – and there's more good news, it could even run to season seven.

"When I said that a couple of years ago, I had this idea for how I wanted the show to end," executive producer Jason Rothenberg said last year. "But it was scalable and that ending could have been at the end of season three, it could be at the end of season five, it could be at the end of season eight.

"Those decisions are not really mine. I don't think that this is a show that runs for 10 seasons. But I love these characters and this world so much that it's fresh for me every year.

"We tell a different story every year so we don't get bored with it. I still have an end story in mind, but I don't know when that end is going to be and I feel very, very confident that I'll get to tell it eventually."

The 100 season 6 cast: Who will be in it?

The CW

Assuming there isn't another massive twist before the season five finale that kills off all of the main cast, Eliza Taylor will return in The 100 season six as lead Clarke Griffin.

Other major cast members include Marie Avgeropoulos as Octavia Blake, Bob Morley as Bellamy Blake, Christopher Larkin as Monty Green, Lindsey Morgan as Raven Reyes and Henry Ian Cusick as Marcus Kane. We'd expect all of them to be back.

And then, of course, there are the new characters, with actor Shannon Kook being cast as a guest star in the season five finale with an option to become a series regular in season six too, so expect to see more of 'Lucas' – even if we don't know who he is yet.

But as we all know, this show isn't shy about killing off characters, with Isaiah Washington bowing out as Thelonious Jaha just two episodes into season five's run, so nothing's certain.

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