Originally, Captain America, his sidekick Bucky, the original android Human Torch, the Torch’s sidekick Toro, and Namor the Sub-Mariner were together as heroes opposing the forces of Nazism. When these superheroes saved the life of Britain’s Prime Minister Winston Churchill from Master Man, the thankful Churchill suggested that they should become a team, known as the Invaders.
The Invaders fought the Axis Powers over the world until eventually finding themselves in England, where they met Lord James Montgomery Falsworth, the original WWI-era Union Jack. He joined the team and provided them with a base of operations in England. Eventually Falsworth’s children Brian (the second Union Jack) and Jacqueline (Spitfire) became members. The team later added Miss America and super-speedster the Whizzer, during a battle with the Super-Axis. Later, against the threat of the Battle-Axis, the team added the Blazing Skull and the Silver Scorpion to its roster.