Identical twins Rick and Dick Walters, being too young to enlist in the army during World War II, were still able to fight spies and saboteurs in the United States as the costumed heroes Yank (Rick) and Doodle (Dick). The two of them were super-strong and invulnerable, as long as they were near each other; when apart, they had no superpowers. At one point during their career, they teamed up with The Green Lama, the first Black Owl, and many other heroes to fight Frankenstein's monster. Whatever became of Yank & Doodle after the 1940s is not yet known.