Origin (3)

1 Avalon (1) 2 Avalon (2) 3 Origin (3) 4 The Ties That Bind 5 The Powers That Be 6 Beachhead 7 Ex Deus Machina 8 Babylon 9 Prototype 10 The Fourth Horseman (1) 11 The Fourth Horseman (2) 12 Collateral Damage 13 Ripple Effect 14 Stronghold 15 Ethon 16 Off the Grid 17 The Scourge 18 Arthur's Mantle 19 Crusade 20 Camelot