We don't often think of Superman as an alien.
After all, with his rugged good looks and ability to hold down a day job, he just seems like a regular bloke.
But Superman comes from planet Krypton, in a galaxy far, far away.
In the famous 1978 film, starring Christopher Reeves as Superman, the villainous Lex Luther, a crazy, evil, genius scientist is trying to take over the world.
Can Superman stop him?
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