Fans of JRR Tolkien's book will know that Legolas doesn't appear at all, making his first appearance in it's follow-up The Lord Of The Rings, but director peter Jackson explains his decision to include him:
He’s [elven king] Thranduil’s son, and Thranduil is one of the characters in The Hobbit, and because elves are immortal it makes sense Legolas would be part of the sequence in the Woodland Realm.
The second in the trilogy, The Desolation Of Smaug, is released December 13th 2013.
