Watchmen

List of relevant keywords:
– Watchmen
– American comic book series
– DC comics
– Alan Moore
– Dave Gibbons
– John Higgins
– alternate history
– superheroes
– 1940s
– 1960s
– Vietnam War
– outlawed
– US government
– murder of a government-backed superhero
– significant literary works
– movie adaptation
– loyal fan base
– tattoos
– Watchmen characters