In December 1937, Walt Disney Productions released its first feature-length cartoon, Snow White and the Seven Dwarfs. It went on to be cinema’s biggest hit of 1938, a success that not only encouraged Disney to make other fairy-tale cartoons for decades to come, but also encouraged another studio, Metro-Goldwyn-Mayer, to try its own fantasy musical about an orphaned girl and a wicked witch: The Wizard of Oz.

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But for all of its similarities to the Disney film, MGM’s version was more of an anti-fairy tale than a fairy tale. Just look at the trio of frightened and feeble misfits that accompanies its heroine along the yellow brick road. None of them is what you’d call a handsome prince. In the clanking of the Tin Man’s rusty limbs, you can hear echoes of Don Quixote’s home-made armour. In the trio’s moaning and blubbing as they prepare to sneak into the witch’s castle, you can see a foreshadowing of Westley, Inigo and Fezzik invading Humperdinck’s castle in The Princess Bride. The pig-tailed Dorothy Gale (Judy Garland) is so wholesome, the Harburg and Arlen songs are so delightful, and the Technicolor adventures are so exciting that it’s still easy to mistake The Wizard of Oz for traditional family entertainment, 80 years on from its release in August 1939. But it upends the conventions of good-v-evil storytelling in ways that would have had Walt Disney fuming.