An off-duty SAS soldier, Tom Buckingham, must thwart a terror attack on a train running through the Channel Tunnel. As the action escalates on the train, events transpire in the corridors of power that may make the difference as to whether Buckingham and the civilian passengers make it out of the tunnel alive.
Sam Heughan
as Tom Buckingham
Ruby Rose
as Grace Lewis
Andy Serkis
as George Clements
Tom Wilkinson
as William Lewis
Tom Hopper
as Declan Smith
Hannah John-Kamen
as Dr. Sophie Hart
Noel Clarke
as Major Bisset
Owain Yeoman
as Oliver Lewis
Jing Lusi
as Zada
Ray Panthaki
as Prime Minister Atwood
Anne Reid
as Charlotte
Richard McCabe
as Callum
