The story follows Jan Zumbach (Iwan Rheon) and the brave pilots of Squadron 303, a group of fighter pilots enlisted by British Royal Airforce after a war-torn Europe has been ransacked by German Nazis. John Kent ‘Kentowski’ (Milo Gibson) has his work cut out for him when he’s handed the angry, defeated, and often maligned squadron to command. Squadron 303 works through language barriers, cultural differences, grief and PTSD to become one of the greatest secret weapons in the Battle of Britain.