Note: To help refresh your memory, wiki links are provided for characters when available.
Bones - "Harbingers in the Fountain"
Supernatural - "Good God, Y'all"
Titus Welliver guest starred as 'Roger/War,' one of the Four Horsemen of the Apocalypse. He was Jacob's nemesis on the season 5 finale of LOST. He also guest starred on NBC's Life as 'Kyle Hollis' the man who actually killed the family the 'Charlie Crews' was framed for murdering.