'The 100'
A poster of "The 100" TV series. The 100/ Facebook

“The 100” season 5 is currently filming the finale, and there’s a new cast member who has joined the last leg of production. The series is introducing a new set of characters once it airs in April.

According to a report by Digital Spy, Shannon Kook has joined as a guest star in the finale. Kook has been part of hit movies like “The Conjuring” and has also worked in “Degrassi: The Next Generation.” The actor will be seen in the 2018 film “Goliath.”

Kook may only be a guest star, but this is said to be an important character with a recurring role in season 6. The TV series hasn’t been renewed yet, only depending on season 5 viewership.

Details about Kook's character are currently kept under wraps. His name has been revealed to be Lucas - the only piece of information available at this point in time.

The next season will be set six years after the second nuclear apocalypse. The characters were split into two major groups in the finale, with one group launching into space to live in the Ark and the other sealing themselves safely inside a bunker. Clarke was left on Earth's surface, but the teaser of next season shows that she managed to survive and is living with a group of friends.

Showrunner Jason Rothenberg said that the next season is a reboot. There will be a new set of characters who will become the enemy group that Clarke and her friends will have to fight.