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.
In December of 1943, the Invaders were sent to Monte Cassino in Italy in order to retrieve a highly coveted weapon known as the Ordnung Zeitgeist before Hitler's forces could lay claim to it. They encountered a strange green mist that propelled them sixty years into the future where they encountered their modern day successors, the Avengers. Note: The events surrounding this incident have not yet been fully revealed. 
The team continued to fight against several threats, and faced an emotional trauma with the apparent deaths of Captain America and Bucky in a drone aircraft's explosion near the end of World War II . After the war's end, several members—including the second Bucky and Captain America (respectively, Fred Davis and William Nasland, formerly the superhero Spirit of '76)—created a new team, the All-Winners Squad. Shortly before this, the original Red Guardian also teamed with Nasland and Namor as an unofficial version of the Invaders in order to protect President Truman, Premier Stalin and Prime Minister Churchill at the Potsdam Conference.
- Later recruits:
- Union Jack II - (Lord Brian Falsworth)
- Spitfire - (Lady Jacqueline Falsworth)
- Vision - (Aarkus)
- Blonde Phantom - (Louise Grant)
- Fin - (Peter Noble)
- Golden Woman - (Gwenny Sabuki)
- Silver Scorpion - (Elizabeth Barstow)
- Destroyer - (Roger Aubrey)
- Thunderer - (Jerry Carstairs)
- Black Marvel - (Daniel Lyons)
- Union Jack III - (Joe Chapman)
- Liberty Legion recruits:
Equipment: None known.
Transportation: None known.
Weapons: None known.
- Their rallying cry is "Okay Axis, here we come!"
- At the end of World War II, the remaining Invaders formed the All-Winners Squad.
- The real world prototype for the Invaders, the All-Winners Squad, was an actual historic Golden Age comic book feature with only two appearances — in All Winners Comics #19 (Fall 1946) and #21 (Winter 1946; there was no issue #20). This team had much of the same membership as the Invaders, but had its adventures in the post-World War II era, the time that their adventures were published.
- After the Invaders' introduction in the pages of The Avengers, the team appeared in its own try-out title, Giant-Size Invaders #1 in 1975, followed by the ongoing series The Invaders later that year, and a single annual in 1977. Issues #5–6 of the series introduced another retcon World War II team, the Liberty Legion, in two parts of a story arc, "The Red Skull Strikes", interlaced with another two parts in Marvel Premiere #29–30.
- The Invaders once killed an entire village of civilians in "Invaders.. Now!!", where they burned and killed a civilian populace, having no other choice, since the civilians became deformed, mindless monsters that turned anything they bit into one of them (Much like a zombie)
- 7 Invaders (WWII) (Earth-616) Members
- 133 Appearances of Invaders (WWII) (Earth-616)
- 34 Images that include Invaders (WWII) (Earth-616)
- Team Gallery: Invaders (WWII) (Earth-616)
- Fan-Art Gallery: Invaders (WWII) (Earth-616)
Links and References