1x01: Air (Part 1)
                              1x02: Air (Part 2)
                              1x03: Air (Part 3)
                              1x04: Darkness (Part 1)
                              1x05: Light (Part 2)
                              1x06: Water
                              1x07: Earth
                              1x08: Time
                              1x09: Life
                              1x10: Justice
                              1x11: Space (Part 1)
                              1x12: Divided (Part 2)
                              1x13: Faith
                              1x14: Human
                              1x15: Sabotage
                              1x16: Lost
                              1x18: Pain
                              1x19: Subversion