Smallville tells the tale of a teenage Clark Kent in the days before he was
Superman. It is the town where he came from where very strange things started
happening with his arrival in a spaceship in the midst of a meteor storm of
green rocks. Clark must deal with a variety of individuals given powers by
the green rocks, keep his powers a secret, cope with his friendship with a
young Lex Luthor, and balance the two girls in his life, Chloe and Lana.
The show also shows us how Lex Luthor develops from a friend of Clark's and
kinda-okay guy to (presumably) the villain who will plague Superman in his
later years.