Union Jack is the name of three fictional characters that appear in comic book published by Marvel Comics.
The original Union Jack, James Montgomery Falsworth, first appears in comics in The Invaders #7. He was created by writer Roy Thomas and artist Frank Robbins. He fights both alone and as a member of the team Freedom's Five.
A peer of the realm as Lord Falsworth, James Montgomery Falsworth is first active as the adventurer and British government operative Union Jack during World War I. During his adventures as a member of Freedom's Five, he encounters the mysterious Baron Blood, a vampire saboteur for the Germans. After the war, Lord Falsworth retires to his ancestral home in England to raise a family.
He is active again as Union Jack during World War II. He becomes a member of the Invaders after the original Human Torch saves his daughter — Jacqueline Falsworth — from Baron Blood. Jacqueline is revived by a blood transfusion from the Human Torch which grants her the power of super-speed. As a result, she becomes the costumed hero Spitfire (a title she still holds in the 21st Century). After the attack, Lord Falsworth offers up his mansion as the Invaders' base of operations. After Baron Blood's attack on Jacqueline, James discovers the vampire is actually his brother, John. During a battle, Blood crushes Union Jack's legs under a boulder, effectively ending his career as a hero. Before the battle ends, James is able to impale Blood on a silver-veined stalagmite. Soon after, he quits the Invaders.
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