Train in vain: All aboard for season three of TNT's 'Snowpiercer'

L-R: Mickey Sumner, Katie McGuinness, Daveed Diggs; David Bukach/TNT

The third season of TNT’s Snowpiercer debuts Monday night at 9 p.m. ET. The action-packed drama concerns a massive train carrying the last remnants of humanity on a non-stop journey around the globe, after the entire planet becomes a frozen wasteland. It’s a high-concept plot, but star Daveed Diggs believes that everyone can see themselves in Snowpiercer‘s diverse cast.

Diggs plays Andre Layton, a former detective who leads a rebellion against the train’s oppressive class system and its maniacal designer, played by Sean Bean. “There are a lot of points of entry