With TNT’s Snowpiercer series continuing to bring its cast together, now comes word on yet more new names to join the upcoming adaptation.

As per Deadline, the show has now moved to add Narcos’ Roberto Urbina and Roots’ Katie McGuinness to its ranks as series regulars. Urbina’s role will be that of Avi, described as “part of a polyamorous relationship that’s reeling from a personal tragedy. He also works on the Breach Team, the train’s equivalent of a fireman.” As for McGuinness’ role, that is a character called Josie McConnell, described as “a strong, no-nonsense woman who lives in poverty at the tail of the train. Josie cares for her sick husband as well as their precocious son. She would do anything for her family, and when unforeseen circumstances turn their lives upside down, she’ll learn exactly how far she’ll go.”

These new additions join the already-announced Daveed Diggs, Jennifer Connelly, Annalise Basso, and Sasha Frolova on TNT’s take on Snowpiercer.

Snowpiercer began life as a Jacques Lob and Jeam-Marc Rochette graphic novel before being turned in to a 2013 movie starring Chris Evans, Tilda Swinton, Jamie Bell, Song Kang-ho, John Hurt, Ed Harris, and Octavia Spencer. The futuristic tale is set seven years after the world has been turned in to a frozen wasteland, with the remaining survivors of humanity taking refuge on a perpetually moving train that circles this icy landscape. Of course, with a mixed bag of various survivors, it’s not long before familiar social themes such as class divides, social prejudice and politics come to the fore.

Where TNT’s small screen version is concerned, Sinister and Doctor Strange’s Scott Derrickson is on board to direct and executive produce the series, while Terminator: The Sarah Connor Chronicles’s Josh Friedman is acting as writer and showrunner.