We Are the Mighty: The Liberator hits Netflix on Veterans Day (Excerpt). Based off the book, "The Liberator: .... [snip] ...is the story of Captain Felix Sparks (Bradley James) and the Thunderbirds' incredible battle against the Axis Powers in Nazi controlled Europe.... [snip] Captain Felix Sparks is played by Bradley James whom you may recognize as Giuliano de' Medici in another of Netflix's powerhouse TV series Medici: The Magnificent. His portrayal of Captain Sparks stays true to the book. Historical accuracy has always been important to our warrior community and Bradley's performance lands it.