Season 4

Episode 1: The Way of the World

Episode 2: Unidentified Falling Object

Episode 3: In A Lonely Place

Episode 4: Brain Drain

Episode 5: Whispers in the Dark

Episode 6: Dying Echoes

Episode 7: The Price of Tomorrow

Episode 8: Our Friends and Neighbors

Episode 9: The Devil's Doorway

Episode 10: End of Innocence Part 1

Episode 11: End of Innocence Part 2

Episode 12: Fall From Grace

Episode 13: Damage Control Part 1

Episode 14: Damage Control Part 2

Episode 15: Forever Came Today

Episode 16: Mightier Than The Sword

Episode 17: Back Talk

Episode 18: Monster's Ball

Episode 19: Infection

Episode 20: Retribution

Episode 21: The Edge of the Abyss

Episode 22: Ghost In The Machine