It was confirmed a while ago that The 100’s seventh and final outing would feature a spinoff, giving fans a glimpse of the nuclear apocalypse that led to the destruction of Earth in the first place. The episode would be set before the start of the first season of The 100 and will delve into some of the mysteries and origin stories of the drama.

In the “Anaconda” chapter of The 100, viewers were introduced to a new group of characters trapped at the end of the world, with the keyword “Anaconda” referring to missiles in the air. While viewers will have to wait for confirmation, Rothenberg already has some ideas about the direction of travel for the story.

With that said, let’s take a look at the characters we saw arriving in the last chapter of season 7.

Callie Cadogan – Iola Evans

The main star of the prequel appears to be Callie Cadogan, who is a strong-willed and intelligent young woman who gives up a place at MIT to join the eco-rebels. Actress Iola Evans portrays the heroine after starring in the Amazon Prime series Carnival Row, Vera, and All of Them.

Reese Cadogan – Adain Bradley

Again Bradley takes on the role of Callie’s brother Reese, who is fiercely at odds with his brother and the pair are arch-rival. American star Bradley has appeared in the likes of Riverdale as Trev Brown and All About The Washingtons.

August – Leo Howard

Taking on the role of Callie’s new friend August. Star Leo Howard has many credits to his name, such as Leo Little’s Big Show, Shake It Up, Kickin ‘In. Most recently, she appeared in Legacies, the Vampire Diaries spin-off, and Why Women Kill.

Dr. Becca Franco – Erica Cerra

Playing the mysterious Dr. Becca Franco is Erica Cerra with the character who doesn’t last long and burns at the stake after returning to Earth with an antidote to radiation. She is also, of course, the ALIE in The 100, but this episode gave her something of an origin story. Cerra has appeared in films such as Power Rangers, Blade: Trinity, and Percy Jackson & the Olympians: The Lightning Thief, as well as Supernatural, Deadly Class, and Rush.

Tristan – Craig Arnold

Craig Arnold takes on the role of survivor Tristan, who is left with 2,000 others after the nuclear apocalypse. Arnold has appeared in Degrassi: The Next Generation, Impulse, and Heartlands before.

Gemma – Crystal Balint

Taking on the role of Gemma is Crystal Balint, following the roles of The Bletchley Circle: San Francisco, Mech-X4, and Prison Break.

Bill Cadogan – John Pyper-Ferguson

In the role of antagonist Bill Cadogan is John Pyper-Ferguson, who makes a brutal decision as the end draws near. Pyper-Ferguson counts Queen of the South, Suits, The Last Ship, and Burn Notice among some of his biggest credits.