Season 1 1.1/1.2 – Air, Parts 1 & 2 1.3 – Air, Part 3 1.4 – Darkness 1.5 – Light 1.6 – Water 1.7 – Earth 1.8 – Time 1.9 – Life 1.10 – Justice 1.11 – Space 1.12 – Divided 1.13 – Faith 1.14 – Human 1.15 – Lost 1.16 – Sabotage 1.17 – Pain 1.18 – Subversion 1.19 – Incursion, Part 1 1.20 – Incursion, Part 2