Based on Frank Miller's graphic novel, "300" is very loosely based the 480 B.C. Battle of Thermopylae, where the King of Sparta led his army against the advancing Persians; the battle is said to have inspired all of Greece to … Gerard Butler, Lena Headey, Dominic West, David Wenham, Vincent Regan, Michael Fassbender, Tom Wisdom Added on HBO 2022-06-07. Added on Amazon Prime 2023-07-19. Youtube Trailer