When does Smallville return?

Smallville is an American superhero television series based on the DC Comics character Superman. The series follows the coming-of-age adventures of teenage Clark Kent in his fictional hometown of Smallville, Kansas. The pilot episode set a ratings record for the series, with 8.4 million viewers. Over ten seasons, the series averaged about 4.34 million viewers per episode, with season two the highest-rated at 6.3 million.