Well Scar, I hope this doesn't only confuse you, but I think Sir Leon should probably be dead. In The Last dragonlord he was the first to volunteer to face the dragon, and all the knights got roasted, completely; I mean, the dragon dominated everyone except (here's a big surprise) arthur, who was conveniently unconscious and merlin, who was conveniently a dragonlord. (but you gotta love convenience) So yes, Sir Leon is slated (not just slated, he is) coming back for season three. But more importantly, he's coming back from the dead. :)
Well ... Sir Leon, portrayed by Rupert Young, is a knight of Camelot and something close to Arthur's second in command. He first appears as a jousting partner for Arthur in "The Once and Future Queen" but pulls away when the Prince is blinded by light. This causes Arthur to want to prove himself as a person, not just because he is Prince. Leon is later unhorsed jousting against 'Sir William' in the tourney.
In "The Last Dragonlord" he took control of Camelot's defence while Arthur was searching for Balinor. He is also the first knight to step forward at Arthur's request for a fighting force against the Dragon. During the battle he was either unhorsed by Kilgarrah's tail or caught in the flames. His actual fate is unknown.
It was revealed by Johnny Capps, that Sir Leon will return in Series 3.
